How to find Intel-based apps that might be triggering the MacOS warning that they won't be supported in a future version.
If you're just now making the jump from an Intel-based Mac to Apple silicon and you use Migration Assistant, you should be aware that if you have a old trail of installs on certain packages (Dropbox and iTerm2 are two) that followed you from previous profiles, you might be in for trouble.
Trouble takes the form of a pop-up warning you that at support is ending for Intel-based apps, and that this version of "ProgramName" will not open in a future release of macOS. If whatever you're using runs automatically every 20 minutes -- looking at you, DropboxUpdateClient -- you will see a lot of these things.
If you are absolutely positively sure you have updated to the Apple Silicon version of whatever-it-is and support is telling you to do things like make a new profile and use it whenever you want to use the app, here's your last resort:
You want System Report, via Apple menu. Then: