Bill Connelly has nicely put up every teams Advanced Statistical Profile, so yes Oklahoma State is there. One of the stats that are kept are win probability percentage.
In The 2015 Advanced College Football Stats Glossary, you can read up on all the definitions for the things you don't quite understand on Oklahoma State's page. One of the definitions is on win expectancy (probability), as you can see here:
This communicates how frequently a team would have won a specific game given that game's primary stats. It is intended to say "Given your success rates, big plays, field position components, turnovers, etc.