First, I would question whether the delayed status is handled the same as a 4473, where you're granted approved status after a certain number of days.
You don't. The ATF has to get a proceed from the FBI before they can approve the form. Though there's no hard evidence it's generally assumed the FBI deprioritizes researching delayed NFA BGCs in favor of researching delayed title 1 BGCs since the latter transfer can proceed after 3 days.