MacRumors published a story that Apple has released the release candidate of watchOS 9.3 to registered developers.

Apple Seeds Release Candidate Version of watchOS 9.3 to Developers

Apple today seeded the RC version of an upcoming watchOS 9.3 update to developers for testing purposes, with the new software coming almost a month after the release of the second watchOS 9.3 beta.

To install the new ‌watchOS 9.3 update, developers will need to download the configuration profile from the Apple Developer Center.

  Apple Seeds Release Candidate Version of watchOS 9.3 to Developers