Have you looked at these?

    https://learn.microsoft.com/en-us/windows/win32/printdocs/printing-and-print-spooler-functions

The EnumJobs WinAPI function might be helpful, but I have no firsthand experience with it.

This might be a question better asked on a Windows-focused forum, like StackOverflow.com. I did a search using the terms "print job completion notification" and received 35 results, but did not look through them. Might be worth a look-see.

Good luck!

Hi Roland;

  You have of course the various PrintXxxx events to let the App know when the Print Starts, Ends and page currently being printed. Tese can be used  for monitoring & then provide feedback that to the App user (if required). However, that's only while the App printing is being sent to the O/S Print Spooler. Once that completes, the PB App is not updated by the Print Spooler on it's part in the actual hard copy printing operations.

Regards .. Chris