To cite package ‘progress’ in publications use:

  Csárdi G, FitzJohn R (2024). _progress: Terminal Progress Bars_. R
  package version 1.2.3.9000, , <https://github.com/r-lib/progress>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {progress: Terminal Progress Bars},
    author = {Gábor Csárdi and Rich FitzJohn},
    year = {2024},
    note = {R package version 1.2.3.9000, 
},
    url = {https://github.com/r-lib/progress},
  }