http://www.techradar.com/news/samsung-galaxy-s8-android-oreo-update-starts-rolling-out

Samsung is now pushing out the upgrade to Android 8 Oreo software on both the Galaxy S8 and Galaxy S8 Plus, but you probably won't be able to download it just yet.

Those who were on the beta for the latest software are set to get the upgrade first, and so far we've only seen it released for those testers in Germany.