I was told that there will not be any pre-made FDC this year but yes, you can get the ink on your personal envelopes for several days and there is no need to rush to the special post offices on the day it is released.
If you want a FDC you should go the FIRST DAY of emission ! Or you can't get a FDC (FIRST DAY COVER!).
https://en.wikipedia.org/wiki/First_day_of_issueA first day of issue cover or first day cover (FDC) is a postage stamp on a cover, postal card or stamped envelope franked on the first day the issue is authorized for use[1] within the country or territory of the stamp-issuing authority