http://wccftech.com/download-ios-11-gm/

The iOS 11 GM (Gold Master) build is now available to download for iPhone, iPad and iPod touch users. This is the final build of the software which will be seeded to everyone in a few days.

The Gold Master candidate of iOS 11 is now available for download. For those wondering: the Gold Master is essentially the final version of a particular software, but meant for developers and testers only. If a last minute show-stopping bug is found and reported, then Apple will release a second GM build to improve the release for the end user. But this is the software which will be seeded to everyone else around the globe later this month. At least for now.