Earlier quoted context omitted.
You have to pay the $99/yr to be in the developer program, to access to the notarization service.
Also I heard that you need fairly new Mac hardware to actually use the notarization service. 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.)
> 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...