The rollout of Windows 10 Fall Creators Update is now fully available worldwide. Microsoft claims it is the fastest a feature update has ever been installed on 100 million devices. Windows will notify users 15 minutes before the update is ready to be installed with a notification like the one below. Microsoft has also modified the way Windows alerts users of the update are notified of the availability of the latest Windows 10 feature update. Users should make sure to install the update in order to benefit from the security updates that were made available since its release.
Source: https://www.bleepingcomputer.com/news/security/windows-10-fall-creators-update-now-fully-rolled-out-worldwide/