I feel like the CPC is trying to import the American constant election news cycle to Canada.
This is a very reasonable time to nominate candidates. They have to find a campaign team, locate physical space for an office, and start fundraising. That's for a minimal campaign.
If they're doing mailers, signs, ads, or a phone bank then they have extra work to do ahead of time. They probably want to start schmoozing with media too.
The NDP also tends to be very organized in elections, so it isn't surprising they're getting started too.