All Stock Futures and Options contracts will be physically settled from October 2019 expiry. Currently, there are 50 stocks that are being physically settled. You can find the list of stocks here.
The transition into physical settled from the current cash mode will be a phased one based on average daily market capitalisation of the stocks. The bottom 50 stocks should be moved by April 2019(the current list already has 50 stocks), the next 50 stocks will be moved by July 2019 and all stock F&O will be physically settled by October 2019 expiry.
Find the SEBI circular here
Read Zerodha’s Policy on compulsory physical delivery derivative contracts here