I'm not really sure how this works, I've seen a couple places where people are saying the "final" ratings for 2016-17 have been compiled. Like here, ranking 142 shows in the 18-49 demographic and 165 overall (Mad TV is still/again on?):

http://deadline.com/2017/05/2016-2017-tv-season-ratings-series-rankings-list-1202102340/

It looks like Sunday Night Football is the most-watched show, no matter how people measure things.