Oh dear! I think we are taking about 2 different animals here.
If you are an EV owner and you want to find out if your (previous model year/ current year...) is eligible for an incentive, then you call MOF. Someone from MOF will review the entire list (from Day 1 of the incentive program) vs. your purchase date.... to tell you if you are or you aren't. MOF has no access to the vehicle that was never been on the list. Got it?
If you are vehicle manufacturer that want to apply for your vehicle to be on incentive list, you apply through MTO.
Ontario Central Forms Repository - Form Identification
So, we all know that model 3 is never on the list, who do you call now? Having said that, you may not able to get any information from MTO because it is confidential if Tesla has made the application or not. Only Tesla HO is able to tell you if they have done it and when they have done it.
One more important point: Although model 3 is clearly qualified for the incentive but the application needs to be approved (someone signs the approval paper) and that person (someone) may not willing to sign anything during this election period.