Translation of "여태껏" in English

여태껏 들어본 적 없던 것입니다.

And he had not been told

불가능해보이죠, 여태껏 아무도 하지 못했습니다.

Seems impossible, no one's done this before,

왜냐하면 저같은 자본가들은 여태껏 이렇게까지 부자였던 적이 없었거든요.

because rich capitalists like me have never been richer.