Yes the Sat shipping is usually the best. Out of the 38 boxes I shipped out that Sat, I believe it was 3 or 4 that didn't make it on Monday but got there on Tues. I have to be careful with my time though because the post offices around here either are closed on Sat or close at 11:30 or 12:00. There is one that stays open until 2:00 (just an outpost kind of place, not a full scale post office) and I actually am sooooooo thankful it is there because I missed getting to mine by 5 min. I thought they closed at 12:30 ( I think they used to) but it was 12:00 and I was panicking about these 38 boxes not getting mailed and having to sit in boxes over the weekend.
I was googling post office location from hear to Alabama to see if there were any that stayed open all day like they used to. That was a close one