How much free space avilable in table spaces into Oracle

How much free space avilable in table spaces

select b.tablespace_name, tbs_size SizeMb, a.free_space FreeMb
from  (select tablespace_name, round(sum(bytes)/1024/1024 ,2) as free_space
       from dba_free_space
       group by tablespace_name) a,
      (select tablespace_name, sum(bytes)/1024/1024 as tbs_size
       from dba_data_files
       group by tablespace_name) b
where a.tablespace_name(+)=b.tablespace_name;

Find out table space in auto extend mode or not

select file_name,tablespace_name,bytes/1024,AUTOEXTENSIBLE,status from dba_data_files order by tablespace_name;