Amazon isn't physically delivering anything to you. It can be anytime between now and 8pm. The truck might look exactly like a UPS truck, or it might look very similar to a FedEx truck...I hope you don't think every trick that delivers Amazon packages looks the same.
Check the date that amazon gives you. I have actually never had a package delivered after that date, only once before as well.
usually it comes with your normal postman. and it will probably arrive tomorrow :)
if the parcel is too big they will usually ring the bell but usually, unless it's an expensive item - you won't need to sign for it.
amazon is lightning fast.