They do not - they drop at the TTC. The only guaranteed way to get dropped off at the MK Bus Loop is to take a Minnie Van. Depending on the day, you may be able to be dropped off at the Contemporary but it's hit or miss.
Looks to be around $30. Be aware they can be hard/impossible to get at peak times like park opening and after fireworks. You can estimate minnie van prices in the Lyft App by plugging in your destinations and scrolling to Minnie Van option.
Just take the free transportation to the TTC. People make it sound like some horrible task to jump on the ferry or monorail over to the MK. The ferry is quite pleasant and isn't as packed. I will always jump in the ferry line if it looks like it is just about ready to cast off.