How to grab the value of an RC return on stms table?

I have to do a massive amount of transports in order from sap gui becouse of the athorization level i got on my company.

i've been using sapgui script to do some simple tasks like adding roles or adding a massive amount of transport request to the stack.

Now i want to make a script that transports some orders one by one in order but only after the previus one is over and the RC=0.

for that I'm planing on readign the icon on the third column to know if its green to proceed.

i've tried to get the value as a text like this:

session.findById("wnd[0]/usr/lbl[24,6]").text

but it doenst return any text.

Do you know how can i get the icon or the tooltip value that apears when i drag the mouse over the icon as a text?

I would really apreciate your help.