Assuming you've been working since in 2025, shouldn't file your taxes in March 2026? If so, you could have received your first NOA in April 2026. So why do you wait to apply for their super visa until April 2027 but not May 2026?
So why don't you land either 1) when have a short notice for the interview - be it August or September? 2) If you don't get interview, land before your PR visa expires in May 2026. Weather-wise is irrelevant.