Following in the footsteps of Verizon, Sprint, T-Mobile, and US Cellular, today AT&T has finally decided to push the update to Android 7.0 Nougat to the LG G5 units it's sold. Since the first batch of G5 units started tasting this treat back in November of last year, it's definitely a case of "better late than never" for AT&T here. The update is rolling out over-the-air, and it's going to be a 1.5GB download so you'll have to grab it via Wi-Fi. It comes with the January 1 security patch level, build number NRD90U, and LG software version H82020j. As always, it might take a few days...
Source: http://www.gsmarena.com/at_ts_lg_g5_finally_gets_android_nougat_update_too-news-23522.php