def get_elapsed_timestamp(self) -> str:
        """
        A human-readable version of the elapsed time for the last execution
        of the step. The value is derived from the `ProjectStep.elapsed_time`
        property.
        """
        t = self.elapsed_time
        minutes = int(t / 60)
        seconds = int(t - (60 * minutes))
        millis = int(100 * (t - int(t)))
        return '{:>02d}:{:>02d}.{:<02d}'.format(minutes, seconds, millis)