How to check top 10 sql order by elapsed time.

Sql statement order by elapsed time.

SELECT sql_id,child_number,sql_text, elapsed_time
  FROM (SELECT sql_id, child_number, sql_text, elapsed_time, cpu_time,
               disk_reads,
               RANK () OVER (ORDER BY elapsed_time DESC) AS elapsed_rank
          FROM v$sql)
 WHERE elapsed_rank <= 10;