As you know USPS delivery time very a lot these days. Please let me know if you have any issues before opening a Case.
What is a first day cover:
A first day of issue cover or first day cover (FDC) is a postage stamp on a cover, postal card or stamped envelope (my items are printed on a #6 envelope 6.5"x3.75") franked on the first day the issue is authorized for use within the country or territory of the stamp-issuing authority. Sometimes the issue is made from a temporary or permanent foreign or overseas office. There will usually be a first day of issue postmark, frequently a pictorial cancellation, indicating the city and date where the item was first issued, and "first day of issue" is often used to refer to this postmark. Depending on the policy of the nation issuing the stamp, official first day postmarks may sometimes be applied to covers weeks or months after the date indicated.