Expect To See Slower Delivery Times For First Class Mail.
With the consolidation of up to 82 processing centers nationwide, a lot of First Class letters and periodicals will cease to be delivered overnight; they will arrive in two days, and mail formerly delivered in two days will now be delivered in three days.
According to the Federal Register, Standard Mail with have the same deliverability as today, with three to 10 days within the contiguous United States. Packages will take two to eight days.
As those 82 facilities close and 95 assume the work, USPS is continuing to focus more on its growing areas of revenue—package delivery—vs. its shrinking areas—First Class mail volume.
Current estimates indicate approximately 20% of the First-Class Mail volume is expected to be delivered overnight, more than 35% is expected to be delivered in 2 days and about 44% delivered in 3 days.
The graphic below illustrates an approximate breakdown of First-Class Mail service performance after Phase 2 implementation:
You can find the USPS official FAQ here: https://about.usps.com/news/electronic-press-kits/our-future-network/ofn-phase-2-faqs.htm