The City of Mississauga's website stated they are hoping to have the design completed for their 1.15 km portion of the OBRY trail by Summer 2026 with construction to begin by Fall 2026 and be open to the public by Summer 2027.
www.mississauga.ca
Not sure how far along the Brampton and Caledon portions of the trail are at this time, though I can see this taking a while given the 51 km length of the overall trail.