Hard to say. They've done it automatically for me with the SSB coin, but have neglected to do it with other things. Assuming you still have GCU I would suggest just rebuying it since it is still available. If you can't rebuy for whatever reason then maybe make a post on the BB Unboxed forums as that sometimes gets the ball rolling on these things too.
Hopefully they Ive them out for free instores when you pick up. I no longer have gcu so I can’t afford to re order it. Wish they would just update everyone’s order whenever there’s a promo like this. Or is this only a 1 week promo thing?