Just got this:
GRODNOKING, congratulations — you’ve successfully registered for the Destination: Miles promotion.
Here's your personalized opportunity to maximize your bonus miles between February 1 and March 31, 20201.
Your offer goal: Spend at least $600 on purchases and earn 1,700 bonus miles.
After you spend $600 in total (your offer goal), you'll continue to earn 1 additional mile per $1 spent (up to 9,000 bonus miles).