Earlier this week, T-Mobile users saw their S7 and S7 edge handsets getting updated to Nougat. It now appears that folks on AT&T are seeing the update. It will arrive over the air in the coming weeks.
Towards the end of last year, Samsung abruptly ended its Beta program and started the general rollout of Android 7.0 Nougat to its S7 and S7 edge handsets. While it did take a bit of time, February seems like a hot month for Samsung handsets in the US, as it is now being reported that those on AT&T are also seeing the update.