Thanks all....I am used to trading the SPX and naively assumed the index was cash settled after buying the spread,and was concerned with hedging the short option if exercised.
One less thing to worry about..With that said,I should probably know the timing of dividends as well..
SPY is not an index; it's an ETF based on the S&P 500. SPX is the index and that's cash-settled.
Good luck!