Please review this announcement from the Postal Service:

On October 1, the Postal Service will implement new service standards for First-Class Mail® (FCM) and Periodicals. These new service standards will increase delivery reliability, consistency, and efficiency for our customers and across our network. Most First-Class Mail (61 percent) and Periodicals (93 percent) will be unaffected by the new service standard changes. Standards for single-piece First-Class Mail traveling within a local area will continue to be two days.

Please download the USPS Fact Sheet on these changes that includes a delivery chart that will help you estimate the new time frames.

You can learn more if you visit USPS online  usps.com/deliveringforamerica

UPI has also reported that "Postal service fees for commercial and retail packages will also increase over the holiday season, between Oct. 3 and Dec. 26."    https://www.upi.com/Top_News/US/2021/09/30/usps-slower-delivery-mail/9131633017249/