Yep as Nino said - They will email you when they are ready to send.
I think they sometimes chop and change the playfield runs a bit depending on whether or not they have everything there that they need for a run .
I did read that they were awaiting the inserts for one of the playfields and instead of twiddling their thumbs decided to push thru a run on something that was otherwise all ready to go . I guess so as not to hold up other projects that are scheduled on the calendar.