To harvest the volatility risk premium in SPY, you could sell 1-month ATF SPY straddles, delta hedge daily at the close during the month, and repeat the process monthly. I have done such analyses in the past, and it’s a lot of work, because you need to
(1) buy a set of option data
(2) find the the closest-to-the-forward options on the trade date
(3) find those option prices daily in the data file
(4) compute the delta daily and compute the number of SPY shares to use in hedging
(5) compute…