Update: The Android 9.0 Pie based One UI update is now live for the Galaxy S8, S8+, and Note 8.
Lastly, Verizon has come up with a date to serve Android Pie for Galaxy S8, S8+, and Note 8 devices. As the mobile carrier will push the latest OS update on April 4 to these phones that are currently running on Android Oreo.
The latest update for these devices brings Android version 9.0 Pie and Samsung's One UI interface along with new features. Also, the update contains March 2019 security patch including bug fixes and system improvements.
The build version for Galaxy S8 and S8+ are - G950USQU5DSC1 and G955USQU5DSC1 respectively and Galaxy Note 8 with N950USQU5DSC1. If the update has not reached to your phone, please be patient because the mobile carrier will soon roll out the update in more phases.
Users of these phones can check this update manually via Settings > Software update > Download update manually.