Performing Better than Early Finish

We just have a team meeting discussing the status of the project I am currently involved with. The Engineering Manager's discussion on how each discipline is performing compared to the timeline caught my attention particularly his comments on the Structures group. This group have been he best performing among all teams as they passed the  early finish curve.

His statement was "It is good to be performing above the early finish S-curve... the only downside is, there will be no more work for them in the coming days...".

This statement means that don't do much more than you are required to deliver. If you are late with your schedule, its bad... if you are advance, it's bad likewise. So just do enough and everybody will be happy!