How to get the oracle dataguard log transfer and applying status?
Oracle Dataguard does not transfer transactions, it transfers log records. Physical standby knows nothing about transactions (logical things), it knows only about changes to the files (physical changes). 

From the standby side, you can check v$dataguard_stats view. It gives information for "transport lag" and "apply lag" in terms of time. 

From primary and standby you can see  what logs were archived (transmitted) and what were applied to the standby:

select sequence#, to_char(completion_time, 'dd.mm.yyyy hh24:mi:ss') completion_time,
       deleted, applied, dest_id, STANDBY_DEST, fal, round(blocks*block_size/1024/1024) mb
  from v$archived_log
 where completion_time &gt; sysdate - 3/24
 order by sequence#, dest_id;


If you have logical standby, then you can look into v$logstdby_progress, etc;

https://docs.oracle.com/cd/B19306_01/server.102/b14239/manage_ps.htm#CHDFFFAJ
https://docs.oracle.com/cd/B28359_01/server.111/b28294/manage_ls.htm#g1057004