I have just received a reply from James (CM of Jolla) and he confirmed that the transporter has no idea about when you've made the order. So the first wave is apparently treated randomly (or some sort of ordering not based on first-come first-served, my surname starts with O, so maybe alphabetically).

Good news is that my order was not somehow stuck because I could not attend the community event.
Bad news is that I am going on vacation soon and I fear the delivery will happen during my period off