After releasing the Android 10 version last year in September by Google, most of the smartphone OEMs are cooking their own software based on Android Q (especially Custom Skins) and trying to release for their eligible devices as early as possible.
Samsung is also one of them and last week Samsung has released the One UI 2.0 update based on Android 10 for the Galaxy Note 9 in some regions. Meanwhile, the T-Mobile Samsung Galaxy Note 9 Android 10 (One UI 2.0) update seems to arrive soon in the U.S.
Still, the T-Mobile carrier users are not aware of this update that when they will receive it. However, AT&T and Spectrum variant users are already getting this new Android OS version. While some of the users are saying that the Android 10 update will be available for Galaxy Note 9 (T-Mobile) after this month.
Meanwhile, some of the reports have been mentioned that the T-Mobile Samsung Galaxy Note 9 Android 10 update will arrive on February 23 or later most probably.
Therefore, we need to wait for more leaks to get confirmed. However, if the update will live for the T-Mobile Galaxy Note 9 variant then the official announcement will be made soon.