Notification when Apple compressor is done
Create an Automator workflow that sends a notification.
Set the Automator workflow as the action to use on completion.


Run Automator Workflow
The Automator Workflow job action applies an Automator workflow to an output file after transcoding.

Workflow: Click the Choose button to set the Automator workflow that the job action triggers.


https://support.apple.com/en-gb/guide/compressor/cpsr6463a5b3/4.5.1/mac/10.15.6