My best understanding is no production number means your dealer doesn't have an allocation for a car yet (e.g. no production with your name on it yet). Doesn't mean you won't get a car, but it means right now the burden is on them to find you a slot.
I think you get a production number at status 111 (order accepted by BMW).
I'd be a little concerned given slots are becoming pretty scarce with EOP in June.