I recently picked up an 85” Sony TV from Costco on clearance for $1399 (this model originally retailed for $2500, its only a step or two down from their top-of-the-line). I connected it to a hardwired ethernet cable, let it do the software updates, then unplugged it. No need for it to be online if I’m just using it with an AppleTV box anyway. I’d suspect an 85” “business TV” would be at least 4-5x the price.
Funny thing was after the software updates, the next day the TV prompted me to install a firmware update on the remote. First time I’ve ever seen that one.
Most TV manufacturers still supply firmware updates as a separate download for installing from a USB drive. I just checked Sony's site for a model that sounds like yours, and they do offer this.
Because sometimes it's necessary to make sure basic features work correctly, I remember my LG Oled didn't work with 4K 120Hz sources until LG released a firmware update for it.
Funny thing was after the software updates, the next day the TV prompted me to install a firmware update on the remote. First time I’ve ever seen that one.