Hello and thank you for accepting my request to join the group!

I'm trying to get my head around the work visa and permit process. So I just accepted a job offer from the school, and they say I start next Monday. I asked him about the work visa and he said that I will hand over the documents to them on the coming Monday and I can start working the same day as long as the documents are submitted. Is this true? Or is he trying to pull the wool over my eyes by throwing some technical jargon over me? (He mentioned something about a waiver, but I didn’t quite catch him)