I got April's patch on the 14th. MMB29X BTW I never turn my data off so I don't know if that will affect the process, but I'm always on WiFi unless I leave my house.
Well I'm guessing that the marshmallow update is delaying the January patch or we will get February's and go to whatever build number that will be. At&t doesn't know anything about the January patch. Go figure
I've never had a delay with security updates until I got the 6.0.1 MMB29K and for some reason we don't have the January patch. I called Google and at&t last week and have had no response back yet.