MacRumors published a story that Apple has released the tvOS 16.6 release candidate to registered developers.
Apple Seeds tvOS 16.6 Release Candidate to Developers
Apple today seeded the release candidate version of an upcoming tvOS 16.6 update to developers for testing purposes, with the beta coming a week after the release of the fifth beta. The RC marks the final version of the software that will be provided to the public.
Registered developers are able to download the tvOS 16.6 update by downloading a profile on the Apple TV using Xcode.