At the rate they're going with the 24/7 work, I'm not sure that it will.
I'm predicting the Dufferin-Strachan stretch will be all done by next fall. The middle section of the Gardiner completed the demolition part as of last week, which is less than 6 weeks from when they started. For context, it took them nearly 3 months to complete the demolition portion of the southern section, and that was a mix of regular hours with 24/7 work kicking in part way through. It should also be noted that even with 24/7 work, they aren't allowed to do demolition (or other really noisy work) overnight.