I received my Costco (Anywhere Visa® Card) Citi rewards certificate. This certificate is not to be confused with Costco executive membership 2% reward certificate. They sent me the certificate via email and I redeemed it at Costco customer service by showing the email barcode on my iPhone.
They distribute reward certificates after your February statements are closed. You should receive yours by March.
Please note: If you are a Costco Executive Member, you will also receive an Executive Membership 2% Reward certificate. They distributed executive membership rewards via the mail two months prior to your annual renewal month.