assuming that you would not be in status once your 485 was denied.
failure to show would result in a denial.
Genearlly, if there must be a reason for postponing the interview (i.e. Ur wife's being in China might be OK).
A reschedule likely would be made in 3-6 months if u could get ur H1 by then.
Disclaimer: The above posting is for discussion only, not a legal advice.