Packages and mail do ship on weekends.
That is as long as you get the package or mail to the post office or UPS, FedEx during normal business hours before they close.
If not then the package will ship the following Monday.
If you order something from a business that closes on the Weekends then the order must be placed before around 12:00 PM in most places so that the package ships the same day.
The USPS does work on weekends.
The post offices are open Monday through Saturday except for some Holidays.
However the USPS sorting facilities are open everyday 24 hours per day and 7 days per week including Holidays so the mail is always being sorted at all hours of the day and all hours of the night even Holidays so that your mail and packages will arrive.
USPS does sometimes deliver Saturday night past 5:00 PM in some locations depending on how much mail and packages they have to deliver.
In other locations USPS stops delivery by 5:00 PM unless they have more mail.
The USPS does pick up mail on Saturday.
If you drop off the mail on Saturday before 4:00 PM at the USPS or in a drop box then the USPS should pick the mail up.
If you get mail delivery at your home then you could put outgoing mail in your curbside mailbox and put the flag up and if the USPS mail carrier comes by your mailbox and sees the mailbox flag up they will pick up your outgoing mail.
USPS does not pick up mail on Sunday.
Although USPS does pick up mail on Saturday which is usually by 4:00 PM to 4:30 PM
USPS does deliver on Sunday for some Amazon packages and Priority Mail Express Packages.
The USPS does deliver today which is Tuesday.
However the USPS does not deliver on Federal Holidays or Christmas but other days other than Sunday the USPS delivers.
The USPS is usually closed on Sunday.
However USPS does sometimes deliver certain packages and Priority mail on Sunday in some locations.
Usually the USPS only delivers some packages and some mail on Sunday in larger cities.
And the USPS sorting facilities are open on Sunday and open all the time 24 hours per day 7 days per week.
The USPS sorting facilities are open all the time and are sorting and moving packages between sorting facilities so that your package or mail arrives to you as fast as possible.
USPS typically delivers packages and other mail between the hours of 8:00 AM to 5:00 PM.
There's not actual set time that the USPS will deliver your mail or packages as it depends where you're at on the mail carriers route.
My USPS mail gets delivered to me around 9:00 AM to 10:00 AM depending on the weather and how much mail the USPS mail carrier has.
For post office box delivery you may get your mail by 9:00 AM to 3:00 PM depending on when they get your mail into your mailbox.
USPS does deliver some Amazon packages on Sunday in some locations.
However Amazon may also deliver the Amazon packages to you on Sunday or if not then the following Monday will be when your Amazon package may arrive.
USPS does not usually deliver mail on Sunday.
However there are some exceptions to the Sunday Delivery of mail by USPS.
USPS does deliver certain Amazon packages and Priority Mail Express Packages on Sunday but most other mail is not delivered on Sunday.
USPS will usually only deliver mail on Sunday in locations such as a large city or large town.
If you're in a small town or get rural mail delivery then USPS will typically not deliver the mail on Sunday and you'll have to wait until Monday to get the mail.
The Postal Service currently delivers Priority Mail Express and certain Amazon packages on Sundays.
Also the USPS mail is still being sorted and being transported on Sunday and Holidays 24 hours per day and 7 days per week through the sorting facilities.
But most mail is not actually delivered to addresses or post office boxes on Sunday.
Normal USPS mail delivery is from Monday through Saturday.
And Saturday Mail delivery is usually not al day and stops sometimes around noon or 1:00 PM