As Sony promised last month, the Xperia 1 and Xperia 5 are now receiving stable Android 10 updates. The Japanese company is distributing the 725 MB updates globally via its over the air (OTA) servers. Sony may be releasing the update in batches, though.
https://www.notebookcheck.net/Sony-Xperia-1-and-Xperia-5-pick-up-Android-10-updates.446029.0.html