Damn near every bank in Canada uses cobol on zOS and DB2. I'd suggest searching job postings at all major banks. Likely you'd need to move to Toronto though because that's where the bank HQs are. Also check out a company called CGI... they have a few Cobol/mainframe positions open right now:
https://cgi.njoyn.com/CGI/xweb/xweb.asp?page=joblisting&CLID...
Also, check out the Cobol cowboys:
https://www.reuters.com/article/us-usa-banks-cobol-idUSKBN17...