Now try to integrate it with your CI, because the feedback that the notarization is complete is sent via email.
(FWIW: I don’t have first-hand experience, though I still have an Apple developer license. Probably won’t renew.)
There is a utility (written in Java) that you run through "xcrun" that can upload, check status, fetch and "staple" the result. It usually turns around within 15 minutes for me, but I haven't measured the exact time. (I'm just polling every five minutes.) Check the "log" file, because it can successfully notarize and then report in the log that your signatures are all screwed up.
Details here if anyone needs to do this: https://developer.apple.com/documentation/xcode/notarizing_y...
> After uploading your app, the notarization process typically takes less than an hour. When the process completes, you receive an email indicating the outcome. Additionally, you can use altool with the notarization-history flag to inspect the status of all of your notarization requests
https://developer.apple.com/documentation/xcode/notarizing_y...
Anyway, even if we say 10.14, I wouldn't call 2012 models fairly new.