Hi, you should always try to maintain legal status while in Canada. Anyways, you are under implied status from submitting your open work permit application if you’ve received an acknowledgement of receipt from IRCC. If you haven’t then you absolutely need to apply to extend your status as a visitor during this time, and write in your letter of explanation that you are waiting for your app to start being processed but there are covid 19 related delays with Case processing centres. Obviously they know this, but wouldn’t hurt to mention..