I downloaded what I think is the final system update to Android 8, Oreo and it is installing on my phone now. The update has installed on my phone and it is a little unclear whether I have the final update. I think I do because I no longer see the beta notification that has been appearing whenever I restart the phone.
The main issue that I have had with the beta has been the performance of the Camera app. For example, if I started the camera while holding the phone in portrait and rotated to landscape, the camera app would re-paint in two parts on the screen. Now after the update when I start the camera app and switch between portrait and landscape the app switches seamlessly.