Would I get any college credits from OCS?

Honestly, you have to ask your college. Your JST will show your military schools. It is up to your college to translate that into college credit. For some OBVIOUS parallels, JST may recommend a college similarity, but it is still up to the college to decide whether or not they grant credit, and what credit they will grant.

For instance: I went to Human Intelligence Collector school. My college at the time chose to grant me credit for "applied psychology." When I transferred, my new college took that applied psych credit and allowed it to fulfill a intro to psych slot in the core curriculum. Either school could have said that the training didn't meet their specific credentialing requirements, and tje first school could have given me nothing, the second could have given me only elective transfer credit.
At the end of the day, the school giving you credit has to make thw call foe themselves as to what standard you have met and whether that standard fulfills the school's requirements.

As far as I know OCS is never was a college credit course.

In my experience, almost none of your military education courses are worth anything at college. The only exception being that they will some times let you substitute some military education for electives, PE and other such courses. If anyone else has had differing experiences, please post.