In addition to the option provided by xmasbaby0, you could remove him from your return completely and electronically file both your Federal and state returns. Then later, after both of your returns have fully processed, file an amended return to reclaim him as a dependent.
Because you would be amending to add a dependent, even if it is done after the filing deadline there would be no penalty or interest incurred because you should be filing to receive a refund amount instead of owing additional taxes due to the change.
On a side note, even though you have confirmation that the state change has been made, you cannot electronically file your state return with your son as a dependent because the Federal return would need to be the same. You can always attempt to electronically file both returns closer to the deadline to see if the Federal amended return has been processed yet for your son. There is no harm in trying.
@tluroc76
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