Waiting to save a larger down payment can lower your CMHC insurance premium meaningfully, since anything under 20 percent down triggers mortgage default insurance, and Saskatchewan also charges provincial sales tax on that premium at possession.
Buying now locks in a purchase price and a mortgage rate you can plan around, while waiting risks both moving against you, though neither risk is guaranteed to appear. A pre-approval that is about to expire is a more useful trigger than a general feeling about timing.
The better question is whether your finances and your timeline are ready, not whether this month is the right month. Get your hand-reviewed valuation from Joel Dyck.