Can I sell call and buy future during last week if call options MTM is in loss?

Lets say I sold 650 CE Tata consumer thinking it will not go above 650 but somehow it goes up and up and close to expiry …I am convinced it will settle above 650 on expiry date so…I am suppose to give delivery of the whole lot but I don’t have stock in demat …so can I buy future a week before expiry ?
Since future is now physically settled as options …will it suffice my requirement to give delivery ?

I believe future will be delivered on same day that I am suppose to give delivery ? (T+2) …correct me if am wrong?

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