NFA Trust this late in the game

I've done an exhaustive search. Just completed a trust generated from National Gun Trust, and had it notarized ten minutes prior to this post. From what I read I can simply "write in" the pre-ban and NFA items the afternoon of July 1st, or months from now, and it won't make a difference as the trust is in force as of today Am I understanding this correctly?

For some color background: I submitted 3 individual SBR Form 1s on Friday and received 2 of them approved this afternoon. What do I do with those?