USPS expects busiest day of the year

The United States Postal Service is bracing for the holiday rush to reach is peak Monday.

USPS said it expects more than 6 million customers to come into stores Monday, and another 6 million to head online to do their holiday shipping and shopping at usps.com -- processing a total of 600 million pieces of mail.

The Postal Service also said it expected Thursday to be the heaviest day for deliveries and urged customers not to wait if they hope to see their packages arrive on time for Christmas.

December 17 is the final day for service to the military, while December 20 is the last day to ship First Class Mail in time for Christmas. Priority Mail can be sent up through December 21 and the deadline for Priority Mail Express is December 23.

[CBS Los Angeles] [NBC]