I ordered a bunch of broilers from Murray McMurray and got an email that they shipped today but the post office website doesn't have the estimated delivery date yet. I called MM and they said they could arrive any time in the next three days. I want to take off to be ready to picked them up at the PO as soon as they arrive but of course it'd be helpful to know exactly when they'll arrive. Do they typically arrive the next day or is it usually longer? This is my first time mail ordering birds so any info would be greatly appreciated.