Hi everyone, looking for some help here on redeeming ANA J or F for next year. I've never booked ANA before so I have no idea on their consistency on releasing premium spaces in advance. Based on my searches on their website, it looks like they release 2 J's about 360 days out? I will need to book 3 premium cabins (most likely 2 J's and 1 F) from JFK to HKG. Here are my questions.
1) I see 2 J's and 1 F open for outbound but the calendar isn't far enough for return (eg. 7/4/2020 JFK to HKG, but want to spend 3 weeks in Asia), so if I select a return date of 7/12/2020 which is being waitlisted, can I just change the return date to a later date when the calendar opens up to a farther out date (eg. 7/25/2020) and w/o changing the outbound date of 7/04/2020?

2) What if I book a flight as described above, but couldn't secure a firm return date, what are the chances of getting approved on the waitlist? And when does ANA normally approve/clear their waitlist--within 1 to 2 weeks of departure? If so, I'll be in Asia by this time and what will happen to my return flight--will ANA just assign me any seats?

Sorry I am coming across as a newbie on this--that's because I am.

Thanks!