How do you hide a Powershell progress message?
You could stop the progress bar appearing in the first place by doing the following beforehand:
$ProgressPreference = "SilentlyContinue";
You could then restore the preference to "Continue" afterwards. Not much help if you actually want the bar of course...
This code forces progress bar to be set to 100% complete and hides it:
Write-Progress "Done" "Done" -completed