Earlier quoted context omitted.
The stock market and housing prices are higher than ever, so a large part of the population is doing good. Not just the elites have benefited from the spoils, people with retirement portfolios and paid-off houses are sitting nice and flush.
84% of wealth in the stock market is in the hands of the top 10% Not sure about housing.
Page 19 of this document produced by the NBER states that indeed, the wealthiest 10% own 84% of all publicly traded stocks, mutual funds, trusts, or various pension account assets:
https://www.nber.org/system/files/working_papers/w24085/w240...
It has many other interesting insights that are worth quickly reading through, for example you mention you are unsure about housing, but that report says the top 10% own 41% of all housing in the U.S.
The other interesting figure is debt, where the top 10% owe 28% of all debt.