How to see the i/o for each tempfile in temporary tablespace

SET PAGESIZE 1000

SELECT SUBSTR(t.name,1,50) AS file_name,
       f.phyblkrd AS blocks_read,
       f.phyblkwrt AS blocks_written,
       f.phyblkrd + f.phyblkwrt AS total_io
FROM   v$tempstat f,
       v$tempfile t
WHERE  t.file# = f.file#
ORDER BY f.phyblkrd + f.phyblkwrt DESC;