USDA loans can take upwards of 90 days. This is becoming very, very frustrating for people selling homes right now. This won't work in the long run. When a seller is looking at 2 competing offers(which CAN happen right now) and one buyer is using USDA...they will hesitate before accepting it because of the ridiculously long time lines.
The USDA should hire more processors, but that isn't happening. If you are a buyer right now, I recommend trying to get approved for a different type of loan than USDA if you want to be competitve. As prices have dropped, more buyers have started looking. If you want to have a competitive offer, you shouldn't have a 90+ day closing.
Just my opinion of course.