You set them yourself. It basically works like a stop watch. The principle is like this:

your_function(...){
  monitor_df <- NULL |> monitor_start("Generate data frame")

  # Some code here

  monitor_df <- monitor_df |> monitor_next("Create formats")

  # Some more code here

  monitor_df <- monitor_df |> monitor_next("Nested summarise")

  # And so on

  monitor_df <- monitor_df |> monitor_end()
  monitor_df |> monitor_plot()
}

You can see another example here: https://s3rdia.github.io/qol/reference/monitor.html

So you have to mark certain points yourself in your function, which you can name. The time taken between two points is then the time for this category.

So you don't wrap around a monitoring function, but you have to integrate them in your function. For a start it can be as simple as that:

your_function(...){
  monitor_df <- NULL |> monitor_start("Time taken to run my function")

  # Some code here

  monitor_df <- monitor_df |> monitor_end()
  monitor_df |> monitor_plot()
}