Yup, this is probably what I'd recommend from Ball Sq. (It is what I do from Medford Sq, but from my house it's easy to shoot straight down Mystic Ave to this point.)
You'll be in traffic from the foot of the Sullivan Square on-ramp to 93, and from there until about the Prospect St off ramp in the tunnel, but other than that, the only other usual backup is that there tend to be slow patches around exit 17 in Newton, though I'm usually going through that area around 8, and it's not been too bad at that hour.
FastLane will be required though - the other place that route can have hold ups is going through the tolls.
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You'll be in traffic from the foot of the Sullivan Square on-ramp to 93, and from there until about the Prospect St off ramp in the tunnel, but other than that, the only other usual backup is that there tend to be slow patches around exit 17 in Newton, though I'm usually going through that area around 8, and it's not been too bad at that hour.
FastLane will be required though - the other place that route can have hold ups is going through the tolls.