how to scan for updates without any internet connection? (wsus cant be used)

Hi,

how I can scan a system which dont have internet connection to know all the applicable updates?

I have to scan 10+ servers for the OS + SQL Server and sharepoint (and other tools) updates.

I cant use WSUS, I cant install it.

I have to work from my station remotly using only RDP connections...

but... I can install WSUS (or any tool) on my dev env.

so if there is command line / powershell utilities which can be used to scan and export the status of each server, then compare it to the WSUS patch list and finally list me the missing updates (and so download them on a folder which can be copied and executed on the remote servers)

thanks for your help.