I’m going to start releasing OS 27 ready beta builds to the TestFlight in the next week or so.
If you are interested in testing request access to the Beta group on this forum.
You do not need to be running the OS 27 betas, as backward compatibility testing is important as well. I’ll start approve requests once the betas are approved by Apple and ready for release. Once you get access to the beta group, you can find TestFlight information in the pinned post in the “Beta” category (restricted access for group members only).