Huawei has now beaten Samsung to the punch, as the Chinese OEM is currently sending out the Android 10-based EMUI 10 update to its flagships around the world. The list of devices to have received the update include the Mate 20, Mate 20 Pro, Mate 20 X, P30, P30 Pro, and a few others.
https://www.notebookcheck.net/The-Huawei-Mate-20-Mate-20-Pro-P30-P30-Pro-are-now-receiving-the-Android-10-update-globally.443008.0.html