From what my manager just told me, they are addressing these in batch, which basically means that they will/are getting to yours if you submitted by the 6th. If for some reason the deadline has been missed, you do not need to amend or do anything further. The IRS will perform their own reconciliation of this (they are already fully staffed for this in order to ensure the minimal amount of dollars refunded to those who actually did receive these 2nd payments) and there is no further action on your part aside from making sure they do not include this in your refund. If this should happen, then technically you've been accidentally overpaid on the refund and they will come looking for it eventually. Just letting you know as I've dealt with the IRS (on the client side) for many years.
