As far as I can tell, yeah it does come to the base around 6 AM in the morning, but it also came around 6PM in the evening. I haven't got through the entire day because I feel like this is ruining my experience of the game. So 2 times a day through my experience with this update of the game.
Also to clarify, this was when I was playing on infinite mode, but it wasn't story mode items it was the daily items that it delivered twice. I haven't gotten a second delivery in story mode yet but I'll play further to make sure.