Will scars in the middle of the chest ever fade?

Yes. They are red and raised for 3-6 months, then start to fade. It will take 1-2 years for fading to finish.
Yes but how much? Yes, but in the meantime consider avoidance of sun exposure with sunscreens, topical elastic gel sheeting, scar massage, and pressure therapy. If the scar continues to grow beyond 6 weeks, consider steroid injections.