https://wccftech.com/download-ios-13-6-gm-watchos-6-2-8-gm-tvos-13-4-8-gm-released/

Apple has released the GM builds of iOS 13.6, iPadOS 13.6, watchOS 6.2.8 and tvOS 13.4.8 to registered developers.

If you are a registered developer or have an earlier beta of iOS 13.6 or iPadOS 13.6 installed on your iPhone or iPad, then we have some good news for you. You can now go ahead and download the official GM builds of the software over the air immediately. But that is not all, watchOS 6.2.8 and tvOS 13.4.8 GM builds are also available.