I suspect it will be more like early May for the South Tower Crane with the North Tower Crane to follow later, being a Geothermal site it ads extra activity in conjunction with the foundations to tie in the Geothermal loops.
The smaller drill rigs are drilling a geothermal borefield, the building’s heating and cooling systems will be connected to the geothermal borefield beneath the building
Metronlinx have posted an RFP for Construction Managers for the Smart Track stations including King Liberty Station
https://www.metrolinx.merx.com/public/solicitations/1918433457/abstract