Saint Thomas was brilliant, and his school of thought still dominates a lot of Catholic thinking. But Thomism is not a dogma of the Church, or even a doctrine.
As for A theory versus B theory, I think Saint Thomas would subscribe more towards the former. That God has knowledge of all points in time at once does not mean that all points in time exist at once or that time doesn’t progress. Thomists are “presentists.” Only the present exists.
I’m not sure I know enough of Craig to have much of an opinion of him, but I do disagree with his dismissal of the God of classical theism in favor of what is called personalism (clarification: God relates to us personally. He is not distant. But I would think it inaccurate to think of God the Father as a person among persons, or a being among beings, just another member of the set of existent things).
I’m happy to hear Craig helped persuade you back to Christianity, though!