Extract from email received just now - perfect timing for me!
Enjoy more with Marriott Bonvoy nowTransfer
before 31 December 2019 and you’ll receive 9 Marriott Bonvoy points for every 4 Membership Rewards points, when you transfer 1,000 or more.1That’s 50% more than the usual rate. You can use Marriott Bonvoy points at more than 7,000 hotels in 130 countries.
Please note that your points will be transferred to your Marriott Bonvoy account within five working days and your additional Bonus Points can take up to eight weeks to transfer. Terms and Conditions apply.