Congrats on passing.
The CPE handbook is your official answer to this question and for that matter, most everything CPE related.
CPE handbook, page 3 proclaims (emphasis mine):
Certified (ISC)2 members are required to earn and submit Continuing Professional Education (CPE) credits during their three-year certification cycle.
Your three-year certification cycle generally starts the first day of the month after you have completed endorsement and will be printed on the face of your certificate when you receive/download it.
So, I am sad to report that attending Cyberworld now would not earn credits for a cycle that has not yet started.