There should not be any question from any officer. Regardless of whether they "say" they aren't enforcing it, Service Ontario is very clear that at the moment, any license place that normally expired on or after March 1, 2020 is NOT expired.. there is therefore nothing to ticket.
I was also going to do it online but the website says you can only renew if they aren't expired yet.. I'm surprised that some have been able to do it so I might try anyways...
https://www.ontario.ca/page/serviceontario-covid-19-coronavirus-response#section-1
Extended expiry date
You may not need to renew your product(s) at this time.
Products that expired on or after March 1, 2020, have an extended expiry date until further notice. We will notify you when it is time to renew.
This includes your:
licence plate sticker