Nothing is certain, except: The FED will not stop to pump collateral (source) into the S&P 500 et al. to support nominal prices. Let's face it: The FED is completely clueless what to do. Also, we do have no clue when looking at the chart, what the real value of anything is, as the FED distorts it all, but read along..
But for what price? The real price. As the FED inevitably pumps liquidity into the system with their current behaviour, this leads to a further devaluation of the US-Dollar in real terms. Hence, stocks do not gain any real price (let alone fundamental value), but only in nominal price to the US-Dollar which itself though looses real value due to expanding the money supply.
But nevertheless to these all time highs, people can't even go to work in the current situation as their job is probably existing anymore or they are in a lockdown situation. The consequence due to America's miserable social security system is that not only millions of people already lost their job, hundred thousands will most probably also be evicted and have to go to foodbanks to not starve to death.
The big Shareholders can sustain their Equity, but the hard working American middle class is getting bleeded out by this devaluation process called "monetarism" (on low-quality steroids). Great...
There probably will be another civil war one way or another, but the SPX will certainly behave in the new "business as usual" uuntil election day (November Third). Then, hell may brake loose.