MacRumors published a story that Apple has released the release candidate of tvOS 17.3.
Apple Seeds tvOS 17.3 Release Candidate
Apple today seeded the release candidate version of the upcoming tvOS 17.3 update to developers for testing purposes, with the beta coming a week after the release of the third tvOS 17.3 beta.
Registered developers are able to download the tvOS 17.3 update by opting in to the beta through the Settings app on the Apple TV. A registered developer account is required.