There is no easy way to check which app is notarized, but if an app isn’t it will refuse to open by default. It will show an error saying the app is from an unk

There is no easy way to check which app is notarized, but if an app isn’t it will refuse to open by default. It will show an error saying the app is from an unknown developer. So you’ll know if you have installed an app that’s not notarized.