How do I see which apps I've moved to my fast drive?
Short answer: Open Apps → Moved. It lists each moved app with when it was moved and where it lives, with Move back, Offload and Uninstall buttons.
Open the Apps window and choose the Moved tab. It lists every app you've sent to your fast drive with when it was moved and where it lives, plus Move back, Offload and Uninstall buttons. Apps that an updater reinstalled are marked Reinstalled by vendor.
In the All Apps grid, a small badge on each icon also shows whether it's on your Mac or your fast drive.