Did any company measure profits after implementing SAFe? How can we know that total costs of implementing SAFe are less than profits?
I think you'll find it difficult to explicitly attribute a rise in profit to an implementation of SAFe. Rather you should look at why SAFe is being implemented in the first place.
- Improve cross-team dependency management
- Improve forward planning
- Improve estimation accuracy for large projects
Once you know the why you can then design metrics that you can capture before/after, which will tell you whether SAFe had a measurable impact on your development process.