How to monitor backup jobs on Oracle 11g?
I might have found a couple of answers on my own. Posting them here in case others need to know:


Google (or my google skills) seems to be getting increasingly less reliable.
Searching the forums at https://forums.oracle.com/ I found this thread: https://forums.oracle.com/forums/thread.jspa?messageID=9956411, which references http://www.morganslibrary.org/reference/dba_best_practices.html. Here is the code mentioned: 


SELECT start_time, end_time, input_type, input_type, status
FROM v$rman_backup_job_details
ORDER BY 1;

and
SELECT vbd.file#, vrbjd.start_time, vrbjd.end_time, vbd.incremental_level, vrbjd.input_type, vrbjd.status
FROM v$rman_backup_job_details vrbjd, v$backup_datafile vbd
WHERE vbd.completion_time BETWEEN vrbjd.start_time AND vrbjd.end_time
AND vrbjd.input_type &lt;&gt; 'ARCHIVELOG'
ORDER BY 2,1;

As for why the query in Enterprise Manager picked older jobs I learned a nice trick from someone at work: You can read recent queries from the view v$sqlarea. Something like select sql_text from  v$sqlarea order by last_active_time desc should do the trick.