Rather than continue to generate daily images with R, I threw together an Observable notebook that takes advantage of the CDC COVID-19 county data datasette (provided by Simon Willison) and the new {Plot} library (by the @ObservableHQ team) that enables users to interactively see the daily county resident vaccination “series complete” percentage distribution.
The full notebook is here — https://observablehq.com/@hrbrmstr/us-county-covid-vaccination-progress — and the interactive visualization is embedded below (though it doesn’t support “dark mode” well):
