code: public function finish($outputStat = true)
      {
          if ($outputStat === true) {
              $this->output->writeln('');
              $this->output->writeln(sprintf('<info>Job finished in %.2f s</info>', microtime(true) - $this->start));
              $this->output->writeln(sprintf('<info>Memory usage: %.2f MB</info>', memory_get_peak_usage() >> 20));
          } else {
              $end = microtime(true);
  
              return [
                  'start' => $this->start,
                  'finish' => $end,
                  'duration' => $end - $this->start,
                  'memory_peak' => memory_get_peak_usage() >> 20,
              ];
          }
      }
docs: Ends statistics collection and outputs or returns statistics.
  
  @param bool $outputStat Wheather to output to standart output, or return data array.
  
  @return array