Leasing signed– since then I have to wait

Good day, I hope my question is right here. I became aware of an affordable A6 leasing deal during the Audi used car weeks. So dealers contacted, passed by, test drive made, application signed. This all happened on Saturday 07.10.. On the following Monday, 09.10., the bank approved the leasing…Wonderful! Seller then said he would send the registration documents to my registration office. (He doesn’t want to personalize you to me.) I don’t get any more information from the seller. Everything went very fast until the shelter, but since then it has been massive. I called him every day at times, wrote emails and asked for updates. This Tuesday (17.10.) he called me in the evening and said they only just had the papers from the bank he had to hand over, because I would be the owner of the letter). Furthermore, the TÜV had expired, which still needs to be made new. So far so good, now the question arises to me whether I should continue to check every day and questions like state of the art is, or whether this is usual, that this can take longer?? Delivery of the vehicle was actually planned for the 30.10., on the part of the car dealership, but it would have to be registered in a log-proof way… Is just my first leasing vehicle so far, maybe that’s why I am so “nervous” Thank you for Your tips!