The consumer "must receive", so you would have to wait until the mailbox rule ran out before issuing a CD.
Section 1026.19(e)(4)(ii) also requires that the consumer must receive any revised version of the disclosures required under § 1026.19(e)(1)(i) no later than four business days prior to consummation, and provides that if the revised version of the disclosures are not provided to the consumer in person, the consumer is considered to have received the revised version of the disclosures three business days after the creditor delivers or places in the mail the revised version of the disclosures.
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