https://wccftech.com/download-tvos-114-final/

If you are an Apple TV user then you can go ahead and download tvOS 11.4 on your set-top box right away. We’ll show you how.

Apple TV 4 and Apple TV 4K users can go ahead and download the latest tvOS 11.4 update right now. Despite carrying a big ‘11.4’ version number, it’s not so big on features at all. In fact, they’re barely noticeable.