You can log into the Oracle database during the R3load execution and use the following SQL to follow the progress:
SQL> select sess.process, sql.sql_text
from v$session sess,
and sess.module like 'DBSL%'
and sql.sql_text like '%FROM%'
order by sql.part;
This will show the OS process ID of the R3load process, plus the table (from the FROM clause) that is currently being exported.
For large tables, you may be able to see the progress in the V$SESSION_LONGOPS table by looking for rows where TOTALWORK != SOFAR.