If this election follows the trend, turnout projections I’ve calculated here show about 59% of voting eligible population, and about 135 million voters will vote in these midterms.
the 2016 presidential election had 136.7 million voters, and 2020 had 158 million for reference. 2018 was about 83.4% of 2016 votes, this would be 85.4% of 2020 votes