In my experience, teachers would wait up until the last day or so to post grades. I think they just have a lot on their plates, and it takes a while to grade assignments for an entire roster of students. In your email, just respectfully ask if he has received the assignments, and if he has graded them yet. You don’t wanna sound whiny, nothing annoys teachers more. Just send him a short, honest email and you should be fine. Good luck.