At my old place it wasn't that great. It was usually in the morning, but right after I left for school. I usually found them at the door when I got home or a note in the mailbox, but it was about 50/50
We moved about a year ago, just down the road from our old place, but it was into the zone of a new post office. This place has been great.
Every delivery is usually in the morning right before I leave for work/uni, or before my brother or mum leave. Either that or they leave a note in the post box.
Only problem is that sometimes they get the wrong unit. The house is one of those 3 on one bloke places, so on the odd occasion they go to the wrong door, which is alright because if the neighbours are home and we ain't, they will sign for it and bring it over when I get home