If that is true and the deaths attributed to Covid are accurate, more than 90% of U.S. citizens have already been infected.
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WHO study:
Infection fatality rate of COVID-19 inferred from seroprevalence data John P A Ioannidis
https://www.who.int/bulletin/volumes/99/1/20-265892.pdf
Findings
Across 51 locations, the median COVID-19 infection fatality rate was 0.27% (corrected 0.23%)...
Conclusion: ... The inferred infection fatality rates tended to be much lower than estimates made earlier in the pandemic.
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Doing the math:
688,737 Covid deaths in the US -
https://www.worldometers.info/coronavirus/country/us/
688,737 ÷ .0023 = 299,450,870 estimated infections
299,450,870 ÷ 331,002,651 (2020 US population) = 90.47% infection rate in the US.