Check out the commentaries (fundamentals VS technicals ) on this chart published 9 months ago
The last up cycle ran for 5 years, this one is 4 1/2 at this point. There is divergence in RSI, CCI, and Fisher (as well as most any indicator you want to pick) when multiyear tops are considered; which seems appropriate for a monthly bar chart. While PE ratios are not at record breaking levels, they are pushing up to the upper limits of what likely makes sense in the current economy.
If a sensible deal can be reached in Congress the upside could be quite spectacular. However, I consider that a low probability event with the current Congress. While they will probably cook up something to kick the can down the road, it is unlikely they will resolve anything that lasts more than a few weeks (maybe months on the optimistic side).
It may not be time to short the market (very difficult to time precisely), but it seems to me it is a time to be cautious.