He's a 1st round pick.
I expect him to get a bit of early playing time, and more as the season wears on.
FWIW, See CIN with back-to-back CB 1st round picks. In their case, Jonathan Joseph in '06 got more and more time supplanting the aging Tory James, and the injured Delthea O'Neal.
Joseph broke his foot off-season in '07, and gained a starting spot mid-year as he recovered and as O'Neal was out with injury. '07 1st rounder Leon Hall played sparingly early on - and like Joseph in his early games, got spanked.
Hall learned, and ended up on some all-rookie teams.
1st rounders don't ride the pine. I think we will see McK extensively come mid-season. I expect he will perform well.