The Xperia X Performance is the fourth Sony smartphone to receive Android 8.0 Oreo
The update is pushed OTA (over the air) and weighs in at around 1.25GB, so make sure you have enough free storage before attempting to download it. It's also worth noting that this has the same firmware number as the one targeting the Xperia XZ and XZs: 41.3.A.0.401.
Sony added the November security patch and the same new features and improvements that we talked about in our previous report: Reminders, Xperia Actions, App Shortcuts, Smart text selection, and Autofill.
Since the roll-out has just begun, we believe it will take some time to go live worldwide, so be patient if it doesn't yet show up on your smartphone, this is a staged push out after all.