In my view, Turing's results are equivalent in computer science (an important part of software creation) to Pythagoras' theorem in geometry (an important part of architecture): incredibly insightful, fundamental, everlasting and useful. Used directly or indirectly in all early works, respectively, in software and architecture. And only a tiny part of the foundational understanding necessary for really mastering the discipline, a level I think we still haven't reached in software.
They are more of an understanding of what theoretically can be computed, rather than anything to do with how to do it or how to efficiently do it. I study lots of theoretical computer science, but it doesn't intersect with software engineering much. Software engineering tends to more relate to project management, operations research etc.