Beta testers appear to be getting access to the update first, though.
Samsung is yet to confirm when the Galaxy S7 and Galaxy S7 Edge will get Oreo but one can probably bet that the Galaxy Note 8 will receive it before they do. Earlier today, the Update has started rolling out in Germany but it is expected to roll out in other countries over the coming weeks. It is also quite possible that someone may have leaked the update on objective.
This means that Samsung will launch the Galaxy S9 and S9+ with Android 8 Oreo out of the box and then start updating its previous smartphones to the latest OS version. If it is available, a manual download option will pop up. If the handset is set up to automatically install software updates, you may open your phone at some point and be surprised by Oreo's sudden presence.
From the above section, you would be able to get the official Oreo update on your Galaxy S8 phones. It's an exciting upgrade and one that you should think about installing soon after it arrives for your version of Galaxy S8. Similarly, it will eventually make its way out of Germany to other regions. SamMobile is also reporting better phone performance after the update.