The antivirus check applies to all employees' machines regardless of OS. We've received guidance from our audit partners that Mac's bundled installation of its antivirus with the Big Sur and Monterey OS versions is sufficient for passing this check. Therefore, if your employees have Big Sur or Monterey OS (version 10.16 or higher), the Drata agent will confirm their antivirus requirement simultaneously.
If you would like to use a standalone antivirus app, please see this article.