OG Chase Freedom Product Change question

Hello! I was considering product changing my freedom unlimited to an OG freedom since I maxed out my flex this quarter quicker than expected with several concert tickets left to buy.

However with it being so close to the end of Q3, I was wondering if anyone had experience with how long after the product change would it take for me to activate the rotating categories? When I got my flex I remember needing to activate the categories by ~15 days before the end of that quarter, so I’m worried that if I initiated the product change today/tomorrow, I won’t be able to use this quarter’s benefits.

Thanks to any who read this!