Living in Montana and based on pass experiences they are probably sitting on the dock at the Post Office waiting for delivery in two or three days assuming the boots didn't go to Great Falls first.
That sounds about right for the USPS.
unfortunately unless its priority mail Billings is a hell of a blackhole of a post office.....we would mail our papers down Wednesday, truck would get them to Billings Thursday around 5am and our Billings subscribers would get their papers on Monday
have had packages coming to me sit in Billings for 2 or 3 days before.....hell even priority sometimes sits for an extra day for no real reason.....when USPS did their last big cost saving measures we went from 7 major centers in Montana to 2, Billings and Kalispell, and the whole mail system in Montana REALLY went to hell.....