Open the windows in your house that face your street, then open the windows of whatever room you'll be staying in the most while you wait....then you'll be able to hear that loud and distinct truck sound that the UPS and FedEx trucks make (well, all heavy duty diesel engines I guess). Well, I can hear them pretty loud on my street at least, but I live at the end of a col de sac in a quiet hood.
I can see the end of the street now through the window. But, cant see it if it already drove past. Which would be when the sound the truck makes happens, when it is driving past the area I can see.
I tried the webcam and VNC route, but the camera wasnt too good quality