https://wccftech.com/download-watchos-5-gm/

You can now download watchOS 5 GM for Apple Watch Series 3, Series 2 and Series 1 devices if you are a registered developer with Apple.

The wait is finally over for Apple Watch users and you can go ahead and update to the watchOS 5 GM build if you are a registered developer with Apple. But before you do that, there are a few things that need to be out of the way.