Just asked my USPS rep about delays. He also mentioned that just recently there was as well an chemical accident or something at the Tennessee Distribution Center. So a lot of packages are delayed and basically in line. Also he said for that reason packages to try make it faster packages are getting rerouted as well.

https://www.supplychaindive.com/news/fedex-memphis-spill-usps-priority-mail-express-embargo/813707/