I applied to Los Angeles and it only took me five days. I thought they were very fast. Maybe it has something to do with Songkron I don’t know, but I think it will surprise you and come soon. Good luck.
I know exactly what will happen to you. Overstaying your 90-day check-in on a DTV visa in Thailand by 30 days will result in a fine of 500 Thai Baht per day of overstay!!! up to a maximum of 20,000 Baht!!! and potentially a ban from re-entering Thailand for a period depending on the length of the overstay.