Enter a timestamp in column M when column B says TRUE but only if column M is blank

function onEdit(e) {
  var s = e.source.getActiveSheet();
  var row = e.range.getRow();
  var col = e.range.getColumn();
  var offsetCol = (col == 2) ? 11 : 12
  var offsetValues = e.source.getActiveSheet().getRange(row, col, 1, 2).offset(0, offsetCol).getValues()
  var curDate = Utilities.formatDate(new Date(), "GMT-5", "dd MMM yyyy")
  var curTime = Utilities.formatDate(new Date(), "GMT-5", "HH:mm")

  console.log(offsetValues[0][0], offsetValues[0][1])
  console.log(s.getRange(row, col, 1, 2).offset(0, offsetCol).getA1Notation())
  console.log(offsetValues == ["", ""])
  if (s.getName() == "Input" && row >= 2 && (col == 2 || col == 3) && e.value == "TRUE" && offsetValues[0][0] == "" && offsetValues[0][1] == "") {
    s.getRange(row, col, 1, 2).offset(0, offsetCol).setValues([[curDate, curTime]]);
  }
  else return;
}