Only if you would have ordered and paid for 1 day shipping. The USPS does deliver 7 days a week including holidays for these packages. It also costs a fortune. You did not do that and Monday being a holiday, you will get it probably on Tuesday. Amazon is not known for their shipping time accuracy.
No. Labor day is a Federal holiday, USPS isn't working.
Regarding Amazon delivery by the Post Office on Sundays...
If you are an Amazon customer residing in the Greater Los Angeles area or New York metropolitan areas, you do not need Amazon Prime service to have an ordered item delivered on Sunday. In this Los Angeles Times news story, the United States Postal Service (USPS) has entered into an agreement with Amazon and began delivery of Amazon packages on Sundays to customers in the Greater Los Angeles area or New York metropolitan areas at no extra charge in November 2013.
http://articles.latimes.com/2013/nov/10/...
For Amazon non-Prime customers along with Prime subscribers, Sunday delivery service expansion was announced in May 2014 to other cities. The Amazon Sunday service is continually being expanded to include new locations.
Cincinnati and Columbus, Ohio
Austin, College Station, Dallas, Houston, San Antonio, and Waco, Texas
Indianapolis, Indiana
Lexington and Louisville, Kentucky
New Orleans and Shreveport, Louisiana
Oklahoma City, Oklahoma
Philadelphia, Pennsylvania
Richmond, Virginia
http://www.foxbusiness.com/markets/2014/...
http://www.usatoday.com/story/tech/2014/...
http://www.geekwire.com/2014/amazon-getting-packages-sunday-via-u-s-postal-service/
Additional areas now offer Sunday service for Amazon non-Prime customers along with Prime subscribers.
Seattle, Washington
Portland, Oregon
Richmond, Virginia
Washington, D.C. (includes Virginia suburbs)
San Diego, California
Phoenix, Arizona
The territory stretching from Eureka, California, to Sunnyvale, California, along with Boston, Massachusetts, is set to gain Sunday service for Amazon non-Prime customers along with Prime subscribers this Fall.
http://www.geekwire.com/2014/amazon-quietly-rolls-sunday-delivery-seattle-portland-many-cities-follow-including-san-francisco-boston/
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Regarding USPS delivery on Federal holidays...
These are the remaining 2014 Postal Holidays, when the Post Office branches are closed and there is no mail pickup or delivery. Most financial institutions, state offices, and federal office observe the same holiday schedule, remaining closed on these days. Other local services, agencies, and businesses may elect to conduct business as usual, and not close.
Monday, September 1 – Labor Day
Monday, October 13 – Columbus Day
Tuesday, November 11 – Veterans’ Day (observed)
Thursday, November 27 – Thanksgiving Day
Thursday, December 25 – Christmas Day
Here is a schedule of the 2015 Postal Holidays.
Thursday, January 1 - New Year’s Day
Monday, January 19 - Martin Luther King, Jr. birthday (observed)
Monday, February 16 - Washington’s Birthday (observed)
Monday, May 25 - Memorial Day
Friday, July 3 - Independence Day
Monday, September 7 - Labor Day
Monday, October 12 - Columbus Day
Wednesday, November 11 - Veterans Day (observed)
Thursday, November 26 - Thanksgiving Day
Friday, December 25 - Christmas Day
http://about.usps.com/news/events-calendar/2014-federal-holidays.htm
No nothing is open not even usps
No; no postal service today. The item might have arrived at a nearby post office on Sunday. You might get it on Tuesday.