Watch-BitsTransfer.ps1

function Watch-BitsTransfer {
    [CmdletBinding()]
    Param (
        [Parameter(Mandatory = $true)]
        [guid]$JobId
    )
    $perc = 0
    while ($perc -le 100 ) {
        $jobState = Get-BitsTransfer -JobId $JobId | Select-Object BytesTransferred, BytesTotal
        $percentCompleteState = ($jobState.BytesTransferred / $jobState.BytesTotal * 100)
        
        $progressParams = @{
            Activity        = "Downloading file"
            PercentComplete = $percentCompleteState
            Status          = "$("{0:n2}" -f $($jobState.BytesTransferred / 1gb)) / $("{0:n2}" -f $($jobState.BytesTotal / 1gb)) : %$("{0:n2}" -f $percentCompleteState)"
        }
        Write-Progress @progressParams
        Start-Sleep -Seconds 5
    }
}