https://wccftech.com/tvos-12-release-date/

It’s finally official – the final version of tvOS 12 will be available for Apple TV 4 and Apple TV 4K users on the 17th of September.

In all the iOS 12, macOS Mojave and watchOS 5 noise, Apple also announced that tvOS 12 will be released on the 17th of September, which is just a few days away from now.