Short answer: not yet.
Long answer: SPY has a history of getting smacked down every time it makes a new high. The trend this year has been when it was brushing against the top-line of a 5-year channel. We are currently only at about 70% of the top of that channel, which means we still have some room. We didn't even touch the speedline we've created with the year's highs. Even if today closes red, it might not matter--algorithms are colorblind.
If, by some chance, we break below the key 189.69 support at open tomorrow, then we short and we've got a long way down to go--up to 7 points (around 183), but at least 2.5 or so at ~187. If we break our speedline at 190.72 then we go long with conviction for a couple of points as we head for the upper levels of the channel where we will flip short.
You could make some money by shorting here, but you'd have to be willing to hold through new highs if the market stays bull. We know it's *eventually* going to go back down because "First Touch Always Fails", but determining where that failure will occur is the tough part. This is a relatively rare instance where I recommend waiting for the trend before committing to a swing trade; from here, there's too much risk without enough gain.
And this, my friends, is why I like to hang out and just wait for a good short signal in the current market. So. Much. Simpler.