How does your delivery system work in the USA?

I’m in the UK and I might add I have not been here for very long. So their delivery system seems a bit of a cheek to what I am used to.

If you order so-and-so they tell you when they will deliver. However, it gets better than that, since they will only tell you the day. It could be from 8am to 8pm for example.

These are paid deliveries. As well as paid services like cable.

How does your system work, what do you think of our system?