Progress bar on Powershell script
Have you tried Start-BitsTransfer?
Example:
Start-BitsTransfer -Source C:\Backups*.mdb -Destination S:\MyDestinationPath\
More info:
Get-Help Start-BitsTransfer
Get more examples:
Get-Help Start-BitsTransfer -Examples
Online: https://docs.microsoft.com/en-us/powershell/module/bitstransfer/start-bitstransfer?view=windowsserver2019-ps