I think when McCarthy met with Jerry Jones, they discussed EVERYTHING, but particularly, the quarterback situation. I think they all know what they have in Dak - whether bus driver or franchise. And they're just letting the game play itself out.
I, personally, believe that the Jones aren't solid on Dak. If so, he would have been signed by now. I don't know if McCarthy is sold on Dak, but he wants to see what he can do with him for one season.
Furthermore, I would not be surprised to see the Cowboys take a quarterback in the first three rounds. That's my prediction. And if Tua or Herbert miraculously drop to 17, it would not surprise me in the least if they took either. McCarthy has worked enough around Aaron Rodgers and with the WCO to know he's going to need a starting quarterback able to run his system and a backup quarterback who can take over if the starter goes down.
McCarthy doesn't have to win now. As long as he puts his plan in motion like Andy Reid did. KC jumped from #27 to #10 to grab Mahomes, giving up, essentially, only a 1st and a 3rd, let Mahomes sit for a year and then, walla, the Chiefs will be perennial contenders for the next 10 years.
I believe McCarthy has a similar plan in mind. Everyone else is watching for DT and safeties. I'm watching the quarterback position because I think that's the key spot and that's where the action is going to be focused. I don't think McCarthy wants to mess this job up. So he's going to take care of that position and determine what he has at quarterback THIS YEAR!