Samsung is rolling out the Android 9.0 Pie for Galaxy Note8 that brings the latest OS and Samsung's One UI interface with multiple new features. As for now, the update is currently expanding in countries listed below, we'll update this list as the rollout expands further.
The Galaxy Note8 users receiving this update as build version N950FXXU5DSB2. For Oreo users, it comes in a full package. While beta testers receiving it as a patch to be added in the current One UI build. You can also check for the update manually by heading into the Settings > Software updates.
Please let us know in the comment if you're not in the list or already received the update.