An alternative to Start-Sleep that adds a progress bar and wait wheel using the FiraCode font. If not running in VSCode and FiraCode font is not setup, then it will fallback to ASCII.

Start-SleepProgressBar.ps1

function Start-SleepProgressBar {
    <#
    .SYNOPSIS
        A Start-Sleep alternative that prints a progress bar with a spinning wheel at the end.
    .DESCRIPTION
        A Start-Sleep alternative that prints a progress bar with a spinning wheel at the end.
        See: https://github.com/tonsky/FiraCode
    .PARAMETER Seconds
        Duration in seconds to wait.
    .PARAMETER NoBar
        Only displays a spinning wheel/line
    .PARAMETER Force
        Forces the display with FiraCode font specific Unicode.
    .EXAMPLE
        Start-SleepProgressBar -Seconds 10
        A Start-Sleep alternative that prints a progress bar with a spinning wheel/line at the end.
        Sample with out FiraCode font Output:
        [################....................] -
        Sample with FiraCode font Output:
         
    .EXAMPLE
        Start-SleepProgressBar -Seconds 10 -Force
        Skip VSCode font detection.
        A Start-Sleep alternative that prints a progress bar with a spinning wheel at the end.
        Sample with FiraCode font Output:
         
    #>
    [CmdletBinding()]
    param (
        [Parameter(Mandatory)]
        [Alias("WaitSeconds")]
        $Seconds,
        [switch]
        $NoBar,
        [switch]
        $Force
    )
    
    begin {
        $IsFiraCode = if ($env:TERM_PROGRAM -eq 'vscode' -and (Test-Path -Path "$env:APPDATA\Code\User\settings.json")) {
            $VSCodeSettings = Get-Content -Path $env:APPDATA\Code\User\settings.json | ConvertFrom-Json
            if ($VSCodeSettings."editor.fontFamily" -like "*Fira Code*") {
                $true
            }
            else {
                $false
            }
        }
        else {
            $false
        }
        $IsFiraCode = if ($Force) {
            $true
        }
        else {
            $IsFiraCode
        }

        # https://github.com/tonsky/FiraCode
        
        $Progress = @(
            if ($IsFiraCode) {
                [char]0xEE06 # 
                [char]0xEE07 # 
                [char]0xEE08 # 
                [char]0xEE09 # 
                [char]0xEE0A # 
                [char]0xEE0B # 
            }
            else {
                "-"
                "\"
                "|"
                "/"
            }
        )
        function Get-ProgressBar {
            param (
                [Parameter(ValueFromPipeline)]
                $Percentage,
                $MaxLength = $($PSCmdlet.Host.UI.RawUI.WindowSize.Width - 2)
            )
            begin {
                if ($IsFiraCode) {
                    $EmptyBarStart = [char]0xEE00 # 
                    $EmptyBar = [char]0xEE01 # 
                    $EmptyBarEnd = [char]0xEE02 # 
                    $FullBarStart = [char]0xEE03 # 
                    $FullBar = [char]0xEE04 # 
                    $FullBarEnd = [char]0xEE05 # 
                }
                else {
                    $EmptyBarStart = "[" # 
                    $EmptyBar = ":" # 
                    $EmptyBarEnd = "]" # 
                    $FullBarStart = "[" # 
                    $FullBar = "#" # 
                    $FullBarEnd = "]" # 
                }
            }
            process {
                $CurrentProgress = [System.Math]::Round(($Percentage / 100 * $MaxLength), 0)
                $Bar = if ($CurrentProgress -ge ($MaxLength - 1)) {
                    "$FullBarStart"
                    "$FullBar" * ($MaxLength - 4)
                    "$FullBarEnd"
                }
                elseif ($CurrentProgress -gt 1) {
                    "$FullBarStart"
                    if (($CurrentProgress - 2) -ge 0) {
                        "$FullBar" * ($CurrentProgress - 2)
                    }
                    if (($CurrentProgress - 2) -lt $MaxLength -and ($MaxLength - $CurrentProgress - 2) -gt 0) {
                        "$EmptyBar" * ($MaxLength - $CurrentProgress - 2)
                    }
                    "$EmptyBarEnd"
                }
                else {
                    "$EmptyBarStart"
                    "$EmptyBar" * ($MaxLength - 4)
                    "$EmptyBarEnd"
                }
                $Bar -join ''
            }
        }
    }
    
    process {
        $StartTime = Get-Date
        function GetTime {
            param (
                $StartTime,
                $Seconds
            )
            $(New-TimeSpan -Start $StartTime -End $(Get-Date))
        }
        while ($(GetTime($StartTime)).Seconds -lt $Seconds) {
            for ($i = 0; $i -lt $Progress.Count; $i++) {
                $ProgressBar = Get-ProgressBar -Percentage $($(GetTime($StartTime)).TotalSeconds / $Seconds * 100)
                if ($NoBar) {
                    Write-Host -NoNewline -Object "`r$($Progress[$i])"
                }
                else {
                    Write-Host -NoNewline -Object "`r$($ProgressBar) $($Progress[$i])"
                }
                
                Start-Sleep -Milliseconds 100
            }
        }
        Write-Host " "
        # Replace with below to print a complete status
        # Write-Host "`rDone!"
    }
}