temp usage with sort segments

select b.Total_MB,b.Total_MB - round(a.used_blocks*8/1024) Current_Free_MB,round(used_blocks*8/1024) Current_Used_MB,round(max_used_blocks*8/1024)
Max_used_MB from v$sort_segment a,(select round(sum(bytes)/1024/1024) Total_MB from dba_temp_files ) b;