Comment on STT Trap - Options Expiry - NSE BSE MCX-SX
If you have bought it as MIS, this will get squared off at 3.20pm, whatever price above 20 it is sold at is your profit. Assuming if you had bought this as NRML, and held the option buy position overnight, your profit will be the price above Rs 20 that you sell tomorrow.
Cheers,