If you are Samsung Galaxy S6 and S6 Edge owner on T-Mobile network then the good news is waiting for you as US Carrier has commenced the Android 6.0.1 Marshmallow update for S6 and S6 edge. The update bumps with the build number for Galaxy S6 to G920TUVU3EPD1 and the Galaxy S6 edge to G925TUVU3EPD1.
Although T-Mobile owners of the galaxy S6 and S6 edge expect to experience all features of Google’s OS including the runtime permissions, Doze Mode conserving battery life when in idle mode, Google Now on Tap, customizable app permissions, and many others, but the carrier has not added any change log for the update on its info page. This time, we are not sure that this update is really bringing all default features of the Marshmallow version for T-Mobile owners of S6 and S6 edge.
If you own S6 and S6 edge over T-Mobile then you should receive a notification for the update. If you are not receiving the update notification yet and want to check the update availability manually, you can try your luck by heading into settings > About Device > System updates > check for update. The update weights around 1.2GB.