Jamie, I understood what you meant about the PCI-e x1 vs the x16 slots.
There are two types of PCI express slots, the very short ones, which are not suitable for graphics cards, and the long ones, which are for graphics cards.
Some motherboards with onboard graphics don't have the long slots, only the short (x1) ones.
Don't know about Amazon's delivery, but I would expect if they say it'll be next day, then it'll be next day.
I don't know which courier they use nowadays either, sorry.