With the beta program now completed, members of the Android Beta Program are now starting to receive the production build of Oreo 8.1. Google released this final build yesterday and those with with Pixel devices and Nexus devices that were in the program should start seeing the OTA update to the production build over the next few days.
The update is very small, just over 40MB, reflecting the fact that the second and final beta of Oreo 8.1 was all-but complete. That small of an update means very few bugs were found to be fixed.
If you are new to the Android Beta Program, there is nothing special you need to do. The OTA will download to your phone just like any other update from Google. It is just a matter of when it gets to your account.
That said, once you do have the production build installed, that is the time to drop out of the program if you are inclined to do so. Removing your device from the program while it is still running beta code will drop it back to Oreo 8.0 and do a wipe of your phone. However, once you have the production 8.1 build, you can opt out and no wiping is done.
For those who were not in the beta program, you will start seeing the update on your Pixel and Nexus devices over the next few days but it can take a few weeks before it gets to everyone.