I think you'd be cutting it a bit close if you applied in December and were hoping to apply it to 2021. Spend on my cc looks to post mid-month every month...Aug 14, Sep 14, Oct 16. Statement date is same date as date that it gets posted to my DL account. Met my bonus in October and my bonus MQM posted Oct 31. Based on my single observation, it would depend on when you have your closing date. I'm not sure the lag between sign-up and closing dates for the statements. If you open your account say Nov 25, will your closing date then be Dec 25? Then end of same month for the bonus MQM / waiver to hit. From what I recall, the spend waiver does not roll over to next year, although your miles and spend will roll over one more time this year.