Tao, I've lived in this area my whole life and know the roads backward and forward. Being that my father used to work at Lockheed and do a similar commute, based on your travel times, you should be fine. There are several roads you can take as alternates. Try Bells Ferry, HWY 5 (Canton HWY). If you end up leaving at 4:30, this will all be a different story.
As for the widening of 575, It is in the works, but no construction has begun yet I believe the DOT is working it into the budget. I'm waiting to get an answer as to when that will actually begin. We can only pray that they will work at non peak hours.