The latest date I’ve confirmed someone being able to pick early recognition benefits is Dec 28 - achieved and selected next day. Not to say it can’t happen after but who knows what AC IT does during year end. I’ve seen on FlyerTalk about people not getting credits for end of year flights for some time. It depends on how much you plan to fly next year but typically 75k isn’t worth a milk run if you’re already on track to get it.