My application is due today and one of the teachers assigned as the mandatory recommender still has not submitted her letter! And I asked her for a letter one august. I even talked with her personally this morning to remind her and sent her an email once I got home. It’s midnight now and she still has not submitted it.
Schools often take the additional bits for the applications as they come in. They know the student can’t control the timing of the recommendations. Tomorrow ask your GC what to do.