check.time: If found, check whether fst file modification time is newer than rds file. The fst is generated based on information in rds, but notice that some systems don't preserve the file modification times. Becasue of that, check.time is FALSE by default.
dir.sims: By default, NMreadSim will use information about the relative path from the results table file (_MetaData.rds) to the Nonmem simulation results. If these paths have changed, or for other reasons this doesn't work, you can use the dir.sims argument to specify where to find the Nonmem simulation results. If an .fst file was already generated and is found next to the _MetaData.rds, the path to the Nonmem simulation results is not used.
wait: If simulations seem to not be done yet, wait for them to finish? If not, an error will be thrown. If you choose to wait, the risk is results never come. NMreadSim will be waiting for an lst file. If Nonmem fails, it will normally generate an lst file. But if NMTRAN fails (checks of control stream prior to running Nonmem), the lst file is not generated. Default is not to wait.
quiet: Turn off some messages about what is going on? Default is to report the messages.
progress: Track progress? Default is TRUE if quiet is FALSE and more than one model is being read. The progress tracking is based on the number of models completed/read, not the status of the individual models.
as.fun: The default is to return data as a data.frame. Pass a function (say tibble::as_tibble) in as.fun to convert to something else. If data.tables are wanted, use as.fun="data.table". The default can be configured using NMdataConf.