So, when you have been working in Canada for a company, on your paycheck you can see that you are paying into an EI fund. If that´s the case for you, you could be eligible for EI. The other main part for being eligible for EI is that you are without work, because for example, the work season was over(treeplanting), you couldn't work anymore because of the elements(wintertime and construction). You can apply for EI on this website;
https://www.canada.ca/en/services/benefits/ei/ei-apply-online.html
A couple days before my work permit expired, I was called by someone from Service Canada, who had seen that my work permit was about to expire and was wondering whether I had already had a new one. I told him I hadn't and that I was going to stop my EI on my last day. He asked about my status and I told him that it was implied status because of PR application blablabla. And than he told me that, because processing times take so long, being on implied status, you are still eligible for EI, to help you over that hump of waiting time.
Hopefully this helps!