Tractor Supply has their own supply chain on their trucks. I think it should be fine. They can do what they like and don't have to be dependent on the post office that is currently backlogged. :)
The embargo notice that I saw was for the day it came out during the storms until Feb 26.
Everyone who orders chicks after that should be fine, but if your shipping date was during those days, you may need to re-schedule your order.