Nice find!
Here is a 2012 sale of a Ruth:
https://www.robertedwardauctions.com...okie-sgc-vgex/
And a 2010 sale of a really nice one:
https://www.robertedwardauctions.com...th-rookie-psa/
Yours isn't quite as nice as the 2012 sale (depending on what the back of yours looks like), BUT Ruth cards have gone way up in value since 2012. So I would say that yours will definitely bring more than the 2012 sale and to find out how much more you will need to grade it and send it to auction.