Baptism should never be delayed once a person understands to what he is agreeing. Otherwise, it might be neglected until too late! In every case recounted in the New Testament, repentant believers were baptized immediately.
Immediately on meeting Saul, later named Paul, Ananias said to him, "And now why are you waiting? Arise and be baptized, and wash away your sins, calling on the name of the Lord'" (Acts 22:16).