Bryant McKinnie says it'll be time to start putting some serious respect on Brock Purdy's name if the QB scores a victory on Sunday ... telling TMZ Sports he'll consider the signal-caller "elite" if he's able to beat Patrick Mahomes at Super Bowl LVIII.
McKinnie -- who won an SB of his own back in the 2012 season -- said he's been impressed with what Purdy's done so far in his first two years in the league ... and if he's able to showcase it one more time in Las Vegas, the former Ravens O-lineman says BP's detractors better get their flowers ready.