Some people have been reporting getting the newest security patch in the past few days, so maybe this is that? I haven't seen any new updates on mine (T-Mobile version) BUT I'm currently out of the country so that might be crippling OTAs.
I got a smaller update recently, bug fix type stuff on my S7 Nougat.. Best way is to ignore Popups and go to the device settings, about device... Software updates...