So you can see he usually do what the market expected him to do, that's why I don't think we gonna get any surprise today. They key will be market reaction.
Now look at the longer term chart below, S&P haven't test 200 days SMA for nearly a year, that's longest bull run in almost 7 years. Why I am saying that? Right now there are lots of bulls out there say S&P could hit 1900, 2000. The thing is market never react positively on monetary tightening and be greedy when other fears, be fears when others greedy. I think today's meeting could mark the beginning of a correction. I could be wrong, but the first rule of trading is preserve your capital, don't take the risk if you don't feel it right, right now I don't feel it right to take risk, remember, no trade is better than bad trade
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