Q: apply for citizenship

Hello, I am currently waiting for my 2nd green card after applying for the I-751. My current green card of 2 years was extended until January of 2020, so I hope to have an answer before that. I have been in the country as a temporary permanent since July 2016 so I have officially been as a resident for 3 years (I married a U.S Citizen), it seems that I qualify to apply for citizenship. Should I wait until I received my new permanent resident card, or can I apply right away? Any information is appreciated, thanks in advance.

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