That's some slow shipping

Should of got my SNES AV cable on Saturday. It’s Monday, and according to USPS, it isn’t out for delivery yet. Either they didn’t update the tracking, or it isn’t coming today either. I just checked my mail, apparently 11 am is to early. They might of put it on a different van, in that case, it won’t get here until after 4 pm. Should I leave them bad feedback because USPS is slow?