Determining Patches Needed without an Internet Connection

Hello,
 

I just installed a 6.1 system and was looking for guidance on determining what patches it might need. The only caveat is that the system is not and will not ever be connected to the Internet.

I am guessing I would do a rpm -qa to gather up all installed packages but where can I go to check and see if there are updates needed for any of these packages?

Thanks in advance for your help.