Sony has sent out Oreo updates to the Xperia XZ and XZs, keeping up its good form of sending updates out on time. We expect the Xperia X phones—X, X Performance, and X Compact to receive their updates in the coming weeks.
https://www.notebookcheck.net/The-Xperia-XZ-and-XZs-receive-Oreo.266608.0.html