Samsung Galaxy S8 update G950FXXU1CRAP is now rolling out with Android 8.0 Oreo. In addition, Galaxy S8+ is also receiving update G955FXXU1CRAP. The latest update includes new features like Parallel Apps, Picture-in-Picture, Smart text selection, new design for Quick Settings, and other features.
The firmware update also includes the latest Samsung Experience UI 9.0 as well as device stability improvements. In addition, the update comes with latest Android February Security patch which brings fixes for Common Vulnerabilities and Exposures discovered in the Android operating system.
Galaxy S8 G950FXXU1CRAP update will gradually release to everyone. You can also check manually for updates, go to Settings > About device > System update.
Make sure you have enough charge on your device at least 60% to 70% before downloading the update.