It depends on how far they have to ship somewhat... I'm in CO and have received most of my orders on Wednesday and Thursday. The hatch date doesn't necessarily mean they will ship that day, so a hatch day that falls on Sunday would ship the next day.
They should show up today; if not, McMurray has great customer service and a quick call or email and they will be able to track it for you if you didn't select tracking on your batch. I'll admit they're not the best at giving tracking info without having to email them.
Sometimes they will delay shipping if there's inclement weather as well, but it should be warm enough to have shipped them.
Nerve wracking either way haha, hope you see your chicks really soon!