My cousin does paint correction and ceramic coating side jobs at his house in Peoria. He's certified professional with the ceramic stuff. A full proper buff and ceramic coat is a minimum 6-8 hour process though. I think he charges around 1k for it. We charge 2-3k for the same at our shop in tempe depending on the level of ceramic coating. There's a big difference between good and cheap ceramic coating as well. The material for a 3-4 coat job from a really good ceramic coating company costs a couple hundred minimum.
You'll have a hard time getting a proper job done by a mobile detailer.
If you want I can get you my cousins number but you'll have to take the car to his house and leave it for a full day if you want a pro job done