My Futures & Options position resulted in taking delivery of the stock, how long will it take for the stocks to reflect in my Kotak account?

On expiry, the stock options that are In the Money (ITM) and the futures positions could lead to physical settlement. If the physical settlement causes taking delivery of stock, then you will receive the stocks in your demat account on T+2 day.

For example, if the usual F&O expiry is on Thursday, then your stocks will be settled in your demat account by the evening of Monday.