Patrick Mahomes is a healthy training camp away from being back behind center when the Broncos visit Kansas City for the teams’ regular-season opener on Sept. 14. He crossed another threshold in his recovery from last December’s knee injury when he was cleared for full participation in training camp Friday. Chiefs coach Andy Reid announced that status Friday. That would seem to put the two-time NFL Most Valuable Player on track to be ready for the Monday Night Football duel in Week 1, but Reid offered a note of caution. “We’ll see about games and all that once we get there. But right now, we’re just going to take it day by day and see how he does,” Reid said. “But he’s been given clearance. At the same time, the NFL wouldn’t have scheduled the Chiefs and Broncos to open in such a prime slot if it didn’t have a good idea that Mahomes would be ready for the contest. A battle with Kansas City led by Justin Fields doesn’t have the same “oomph,” in the parlance of Vic Fangio. Reid want...