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Unfortunately there isn't anything you can do. Citi does not expedite the shipment of their cards and it will take 7-10 days to get the card. First you'll get an approval mailer from them with the card's PIN followed by the card in a day or two. I know that's not the anwer you want but Citi is well known for this policy.
Forgot to mention but most importantly, congrats on the approval!