I posted 3 alternatives you can use in this thread:
As for your question, it should be possible. Though you gotta be more precise on which save? Regular save/save as? autosave? And do you need it to stop before the save?
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There is imageSaved(filename: str) [signal] inside Notifier.
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You can technically hook onto actions such as
Krita.instance().action('file_save').triggered.connect()
But if you want it to stop your code before the save, that may be more complicated. You can try a directconnection and see if that works, if not, you might need to do an eventfilter.