What does 'making good' a course mean?
Short answer
Achieving the desired track over the ground after accounting for tide, current, and leeway
To 'make good' a course means to actually achieve that track over the ground. The course made good (CMG) is the resultant direction of travel after all influences — tidal stream, current, and leeway — have been accounted for. Similarly, 'speed made good' (SMG) is the actual speed over the ground.
Quick check
What does 'making good' a course mean?