Sony Mobile has started to rollout Android Oreo for Xperia X and X Compact smartphones. The update weighs around 1.2GB in size and changes the version number to 34.4.A.0.364 from 34.3.A.0.252. The update brings all the features from Oreo and brings January security update.
To check update manually, head to settings-> About-> Software update. Update will be rolled out in phases, it will take couple of weeks to rollout for all eligible devices.