How to Activate MacOS's "Do not Disturb" — shamelessly copied from https://github.com/johnotander/do-not-disturb

disable-non-sierra.sh

# Disable DND on non-Sierra
osascript >/dev/null <<'END'
tell application "System Events"
  tell application process "SystemUIServer"
    try
      if exists menu bar item "Notification Center, Do Not Disturb enabled" of menu bar 2 of application process "SystemUIServer" of application "System Events" then
        key down option
        click menu bar item "Notification Center, Do Not Disturb enabled" of menu bar 2
        key up option
      end if
    on error
      key up option
    end try
  end tell
end tell
END

disable-sierra.sh

# Disable DND on Sierra and above
osascript >/dev/null <<'END'
tell application "System Events"
  tell application process "SystemUIServer"
    try
      if exists menu bar item "Notification Center, Do Not Disturb enabled" of menu bar 1 of application process "SystemUIServer" of application "System Events" then
        key down option
        click menu bar item "Notification Center, Do Not Disturb enabled" of menu bar 1
        key up option
      end if
    on error
      key up option
    end try
  end tell
end tell
END

enable-non-sierra.sh

# Enable DND on non-Sierra
osascript >/dev/null <<'END'
tell application "System Events"
  tell application process "SystemUIServer"
    try
      if not (exists menu bar item "Notification Center, Do Not Disturb enabled" of menu bar 2 of application process "SystemUIServer" of application "System Events") then
        key down option
        click menu bar item "Notification Center" of menu bar 2
        key up option
      end if
    on error
      key up option
    end try
  end tell
end tell
END

enable-sierra.sh

# Enable DND on Sierra and above
osascript >/dev/null <<'END'
tell application "System Events"
  tell application process "SystemUIServer"
    try
      if not (exists menu bar item "Notification Center, Do Not Disturb enabled" of menu bar 1 of application process "SystemUIServer" of application "System Events") then
        key down option
        click menu bar item "Notification Center" of menu bar 1
        key up option
      end if
    on error
      key up option
    end try
  end tell
end tell
END

You can integrate this script with the Focus app.

fucking awesome ! thanks !