Entry Ban Clarification

[Traveller@world]

Hi everyone. If we have an approved employer specific work permit, do we need to provide any proof while traveling, except the introduction letter given by IRCC and our passport with TRV? This is all that’s mentioned in IRCC’s website. But it’s confusing to me how airline staff would be able to distinguish open or closed work permit, and whether the employer’s business is shut down or not. I would apprecite it if you could advise.