When you come across the phrase 'Arrived at a regional center' on your USPS tracking, it doesn't necessarily mean that your mail has reached its final destination before delivery. It could be that the journey has just started or ended. The message simply indicates that your package is secure and is on its way to its delivery destination. The USPS Regional Facility is a mail processing center that serves a particular area within the United States.
If your package or letter says that it has left the USPS regional facility, it implies that it is on its way to the regional facility and should be delivered soon. USPS operates 22 mail processing centers in the US, and the time mail spends at these regional USPS facilities varies depending on the destination, but usually takes about 24 hours. To expedite the shipping process, you can use Priority Mail Express. However, in some extreme cases, your mail may remain at a regional USPS facility for more than a couple of days before enough mail is collected to continue the trip. It also depends on the area where you live, so it's best to track your package several times before it arrives at the local post office. A USPS destination center is actually the last place a package goes before it's sent to the delivery post office.
Each region of the country has a distribution center, which acts as a central mail exchange center for that region or as a reference point for mail to pass on its way to another regional distribution center. Inclement weather, problems at that specific USPS regional facility, machinery breakdowns, and many other circumstances can speed up or delay the transfer of mail through a regional or next facility. The employees of these facilities are either USPS employees or subcontractors of the USPS, and these facilities often have made huge investments in security to protect their mail and the facilities themselves. If you have further questions or concerns about your shipment, you can contact the USPS customer service number in your region. The Postal Service is made up of a network of distribution centers (as well as post offices) that are used to take packages where they should go. An SCF (Sectional Center Facility) sends mail between local post offices and to and from network distribution centers.
When packages arrive at the USPS destination facility, they are ordered by zip code in groups so that all packages with similar zip codes are directed to the same post office before delivery. In addition, every time a new email or package arrives in your virtual mailbox, you will receive a digital scan and notification directly by email and through your customer control panel. According to another Quora user, if your package is at the destination facility (or at the distribution center in your own city), you'll likely receive it on the next business day. USPS regional facilities aren't as glamorous; they look more like high-tech warehouses than anything else: an information clearing house to make sure mail always goes in the right direction. The packages come in, are scanned and ordered (you will see an update in USPS Tracking after scanning them) and leave for the next center.
