It is downloading now via WiFi only. I have a moto G4 plus phone. I live in Barrie Ontario
It's installing on my G4 Plus right now. I have an unlocked Canadian phone on the Wind/Freedom network.
Feb 1, 2017 here, and still no update in USA on T-Mobile for Moto G4
Hopefully Moto G4 none plus will get it's Nougat update by the end of January as promised by Lenovo. Love the phone and Nougat should make it even better.