Please don’t worry. Music ed is held to a different standard than performance and he will find a school. Often if the musician is not quite there in terms of ability, they will get a provisional acceptance to the major and take lessons and practice until they are good enough to pass an audition.
My music major kids practiced in high school, but not obsessively. Not more than an hour a day unless they were preparing for an audition. They did NOT have access to private lessons or participate in outside groups. Their public school has a wonderful music program, but half the school year was focused on competitive marching band which isn’t all that great for honing music skills.
My D is now working on her music BA at a SLAC with a conservatory and is the top musician in her studio and my S is going to a private college with a decent sized music school doing a double degree in music ed/ performance and also ranks very highly in his studio (it’s more competitive than my daughter’s college and he is an underclassman). It was an adjustment from high school to college for both of them but they are thriving.