It looks like good things come in packages from Verizon. Big Red just started pushing out the Android 6.0 Marshmallow update to not just one, nor two, but three different smartphones at the same time! Marshmallow is heading out OTA to the LG G3, the LG G4 and the HTC One M9.
Don't worry if you don't see it yet. Per the usual M.O., the update will stream out in waves. If you are the impatient type, you can constantly go to About Phone --> Update Center --> System Updates --> Check for Update on the LG devices. Alternatively, you can go to Settings --> System Updates --> HTC software update --> Check Now on your HTC One M9.
Kudos Verizon!
Here's our dedicated sections for each of these phones:
Verizon (1), (2), (3)