オープンワークを永住権と同時申請していれば、ビジタービザを延長する必要はありません。
Inland applications for permanent residence
In situations where an applicant who has visitor status submits an application for permanent residence to Vegreville and at the same time submits an application for a work permit (pursuant to R207(b)), the visitor may be considered to have requested an extension of their TR status (in accordance with R183(5)). They are considered to have implied status as a visitor, until a decision is made on their WP application.
http://www.cic.gc.ca/manuals-guides/english/ip/ip06e.pdf、p.6