Yes, you should be issued a temporary license. Old school paper, and there should be three of them - one for the license, one for the medical, and one for the radio license, although this last one is not issued by Transport Canada but by Industry Canada so it may take a little longer.
As for submission by email, I'm not sure - when I came back from overseas 15 years ago you had to go into the closest regional office to get it done, and I don't think they've improved that much since then, but I'm willing to be pleasantly surprised. Your best bet is to ask directly. Find the
region you'll be working and living in and contact them directly. They do have an email for each office, but because you have to submit the licensing fee along with the application, they may not accept the submission that way.
As for the
service level of when you should see the license back, expect 40 business days from the date they receive your application if it's mailed in. But if you can make an appointment to go in, that's better. I had my license in hand within 40 minutes.