To cite package ‘progressr’ in publications use:

  Bengtsson H (2024). _progressr: An Inclusive, Unifying API for
  Progress Updates_. R package version 0.15.0,
  <https://CRAN.R-project.org/package=progressr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {progressr: An Inclusive, Unifying API for Progress Updates},
    author = {Henrik Bengtsson},
    year = {2024},
    note = {R package version 0.15.0},
    url = {https://CRAN.R-project.org/package=progressr},
  }