Confirmed, the last pickup is at 6 PM. It can be earlier if there is bad weather either locally or in Memphis (or on holiday). It is a good idea to shoot for 5:30 as Amber said, because 6:00 is when the drivers leave, even if there is still a line - you want to make sure there is time to process your shipment.
The last pickup of the day is 6pm. It depends where the shipment is going, but in most cases, 6pm. I try to get stuff there by 5:30 in case they are early to be safe.
Thanks! Your answer is awaiting moderation.