how to view the current sql queries?

[PAVB]

You guys are not answering OP's question.

Providing you know the username of the user you want to track you might want to try:

select  a.username,
        b.last_load_time,
        b.sql_text
from    v$session a,
        v$sql     b
where   a.username = 'USERNAME_YOU_WANT_TO_TRACK'
   and  a.sql_address = address
order by b.last_load_time desc
;