do i need to be home for iphone x delivery

Sounds to me like a police matter.

NO clue who is delivering but yes you have to sign for it. You can pre-sign for it by going to your order online and printing out the thingy you need.

The carrier was UPS. They said no signature was required (same thing was written in the apple email they sent me: No signature required for delivery) and thats why they delivered it and left it near my front door.

So UPS says they have delivered it and Apple is saying they have launched "shipping investigation" but no one is giving me any concrete answer! In the meantime, I am paying monthly installments for the phone I have not yet gone.