Shortly after the Samsung Galaxy Note5 on T-Mobile started receiving it, the Marshmallow update has begun hitting T-Mobile Galaxy S6 edge+ variants as well. While the update brought Android 6.0 to the former, the latter gets Android 6.0.1.
Weighing in at 1.34 GB, the update bumps the software version to G928TUVU2DPD1. As you'd expect, the update brings along the usual Marshmallow goodies, including Doze, Google Now on Tap, and redesigned app permissions.
Given the fact that the update has just begun rolling, it may take some time before it hits your device. However, if you're feeling impatient, you can manually check for it by heading to the Settings menu on your handset.