It will delay the process
Hi,
If you can avoid then do not delay FPs. As it is that NSC is extremly slow in processing i485, in that why do you want to add the delay?
However if you have already got FP notices, then please go to your local INS & ask them if you can give FPs before your assigned date. I know most local INS allows you to do this. You can explain your reasons to them.
Also if your ND/ND is not in the current processing window then you can postpone FPs. Currently they are processing cases till May 01.
Achiever