This is typical. Unfortunately. Recommendations are a pain. Chances are they have not opened it yet
I had to write quite a few at one point in time and while I had 2 months of notice, I finished them 3 days before the deadline. Schools are aware of the challenges that people face with recommenders and some have made it possible for recommenders to submit LOR's past the deadline (not that you should be counting on this or planning this).
Have you gone back and forth with your recommender over the questions? or given them a hand in helping out?
I have had a few things that were annoying. The LOR is asking for ranking oacross multiple factors (a matrix). I know that I can't show/say that the person is 100% so I have to give them a 4 instead of a 5 in a few categories but not sure which ones so it would be helpful if you could your recommender which areas you want to grow and don't feel you quite have a 5 yet. That makes their life easier and they can obviously choose to over-rule you.
Is this recommender an MBA? the above may not be needed or coaching may not be needed if they have an MBA and the opposite is true if not.
P.S. Which deadline did you communicate to the recommender? They may not think it is an issue while you are stressing out. Maybe they are planning to fill out Jan 5th?