Look for App Updates
If you want the best possible Android Oreo experience on your Galaxy S7 you'll want to download app updates as they arrive.
Samsung's already updated some of its applications (like Samsung Pay) with support for Android 8.0 Oreo. These updates are essential if you plan on downloading Android Oreo right away.
Before you download an update to your Galaxy S7, make sure you read the reviews from Android 8.0 Oreo users.
These app reviews will alert you to benefits, and issues, with the current version of the app.