Can I ship a package before the shipping date ?

[gia.c.v]

Hi.

I was wondering can I ship a package before the shipping date ?

When I create a USPS shipping label, theres option " Mailing date ".  I picked Friday but some personal things cancelled it tomorrow.  So i was wondering if i can ship the package before the date i picked ( Since the label i printted that shows the mailing date is friday 5/26 ) ??

Do i have to drop it off at USPS or I can just leave it in the mailbox ( since is already paid ) ??

THANKS 🙂