Apple has released the GM build of macOS High Sierra to Mac users participating in the developer preview and public beta testing programs. GM stands for Golden Master and typically represents the final build of what was beta software that will become the public release.
macOS High Sierra includes the all new APFS file system, speed improvements to Safari, new features added to the Photos app, a newly updated Siri voice, updates to underlying graphics technologies, and a variety of other refinements and improvements to the Mac operating system.
Any Mac user who is enrolled in either of the beta testing programs can find macOS High Sierra 10.13 GM available to download now via the Updates section of the Mac App Store.
Always backup a Mac before installing any system software update, whether it is a beta release or otherwise.
For those wondering, MacOS High Sierra 10.13 is compatible with all Macs that support the prior release of MacOS Sierra 10.12.
MacOS High Sierra has a release date scheduled for September 25, though the impatient can enroll in the High Sierra public beta testing program and access the GM build now.
iOS 11 GM is available to download now too via the beta programs, before a September 19 public release.