code: def get_datetime_issue_in_progress(self, issue):
          
          histories = issue.changelog.histories
          for history in reversed(histories):
              history_items = history.items
              for item in history_items:
                  if item.field == 'status' and item.toString == "In Progress":
                      return dateutil.parser.parse(history.created)
docs: If the issue is in progress, gets that most recent time that the issue became 'In Progress'