For First and Standard Class mail, the Processed for Delivery scan is the last scan event that USPS provides (please note that scans are not guaranteed by USPS, but we do see scans on over 99% of our mailings). When your mail piece receives this scan event, that means that USPS will attempt delivery within one business day. If your intended recipient confirms that they haven't received the mail piece despite the presence of a “Processed for Delivery” scan, please reach out to support@lob.com with the letter_id, check_id or postcard_id and we’d be happy to investigate.