https://wccftech.com/today-in-android-galaxy-s8-and-galaxy-s8-get-oreo-on-us-cellular-galaxy-s7-and-galaxy-s7-edge-update-halted-and-more/

It turns out, the Oreo saga for the Samsung Galaxy S8 and S8+ wasn’t over, after all. Most international and carrier-locked (and unlocked) variants of the devices have already received the update, but there are still a set of users that are yet to get a taste of Oreo. U.S Cellular was a bit late to the Oreo party and began rolling out the update for the Galaxy S8+ and S8+ today. It’s now rolling out firmware version G950USQU3CRD4 and G955USQU3CRD4 for the Galaxy S8 and S8+ on its network.

The update will be rolling out in stages and may not be available to all the eligible devices at once. If your US Cellular variant of the Galaxy S8 or S8+ hasn’t received the over-the-air software update notification yet, you can try to manually trigger the update from the Software update menu in the Settings app. The update brings the latest version of Samsung Experience to the device and all the Oreo goodies.