How much free space does he have? The game needs, I believe, 45Gb. Many people are finding that they have to uninstall pretty much everything on the headset to make enough space for medal Of Honor including any saved videos, screenshots etc. I've even heard of a few people that had to do a factory reset to get enough room.
Plus, a lot of people are reporting slow and faulty downloads at the moment due to an ongoing technical problem. I can imagine the biggest game on Quest (by far) would suffer proportionately more. Again, the Oculus advice is to do a factory reset to fix that one.