Wait till you get your RFPR, MR request. When you send your PCC, RFPR fees send your new employment information. In the cover letter, just write that your employment situation has changed and attached are new documents. Don't send multiple packages to them. As it is they are backlogged. I moved from US to canada in middle of my FSW app and I did the same. I informed CIC of my immigration when I got my MR/RFPR request.