Here is how you can enjoy watchOS 5 GM immediately

Shortly after Apple held their “Gather round” event they are released watchOS 5 GM to the developer beta testers which is the final watchOS 5 release. For those who want to enjoy watchOS 5 before it is released to the public can still install using the beta profile on their watch immediately.

It is important to note that you will need to be running iOS 12 builder or GM which you can access via this link. Please note watchOS beta are for developers only however the GM is the final public version that will be officially released on September 17th. You can view the release note for WatchOS 5 here.