Here are Canadian athletes that are currently not with a qualifying time/distance or ranked high enough to qualify for Tokyo atm (note this list is not exhaustive). I did not include anyone in the women's 400m or Men's 100 as the top 5 in each distance is likely headed to Tokyo due to relays. I have also not included any event with 3 or more Canadians already qualified.
Men's 400m - Philip Osei and Austin Cole are likely going to be added to the mixed relay. Myles Misener-Daley is aiming for the individual race, but has had no recent results, so not sure. If we put the top 4 Canadian men in the 4x400 relay, I think they could hit a good time, but I think its too late for Tokyo.
Men's 1500m - Another solid result in the mid 3:30's will get Charles Philibert-Thiboutot into a ranking position to qualify. Kieran Lumb and William Paulson need a couple more results in the mid 3:30's to also make into a ranking spot. Lumb I think will end up qualifying in the 5000 as I do not expect Hughes to compete in this event in Tokyo.
Men's 3000m steeplechase - Ryan Smeeton is going to need two times under 8:30 to qualify via the rankings.
Men's 110m hurdles - Joseph Daniels is not shown in the rankings, but he should be there shortly, as he has 5 races to be ranked. By my calculation he will be in a qualification position, but doesn't hurt to get a PB below 13:50 or less
Men's high jump - Django Lovett and Derek Drouin will both need the 2.33 standard to qualify this late.
Men's pole vault - This is a mystery as I do not know what the latest is with Shawncy Barber.
Men's discus - Jordan Young will need 4 more performances of 64.84+ metres to qualify. He had that earlier this year.
Men's hammer - Adam Keenan has a PB of 74.71 in 2019. 5 of those performances would qualify him for Tokyo. He has not competed this season
Men's decathlon - 2010 World Junior bronze medalist in the Long Jump, Taylor Erhardt is aiming to qualify, and would be a third entrant in this event for Canada.
Women's 100m - A repeat performance from 2019 nationals at the 2021 edition for Leya Buchanan will see her qualify via rankings
Women's 400m hurdles - Noelle Montcalm, needs a top 2 finish at nationals + a good time (under 57 seconds) to qualify via rankings
Women's 3000m steeplechase - Alycia Butterworth would qualify via rankings with a repeat performance at nationals. Charlotte Prouse needs another sub 9:38 race to qualify.
Women's long jump - Christabel Netty is one spot out of the rankings qualification. A repeat performance at nations will jump her back into qualification. Hopefully she can find her form from a few years back, when she hit 6.99.
Women's triple jump - Caroline Ehrhardt will need the standard (14.32) to qualify, which is quite a distance from her PB.
Women's discus - Rachel Andres will need a repeat performance at nationals and at least another big throw to qualify.
Women's heptathlon - Both Georgia Ellenwood and Niki Oudenaarden need a PB at Nationals (not sure if this event will be at nationals however)