Nice repair job and I like the team effort. Smart to sew it up before a gust of wind blows out the seam.
I'm currently repairing some seams and have to do the job solo, and thought I would post some photos of my rig the holds the awning partially open, for anyone else in my situation.
A tie-out stake for a dog is used as the anchor point in the ground, and it is connected to the awing pull strap with a rope. If you remember your taught line hitch from Scouts, that is the knot to use so you can easily adjust the position of the awning. I also had a taller step ladder so I could sew from above.
One final comment. My problem, and I suspect yours too, is that over time the hinges on the aluminum slats which form the awning cover, chafe on the threads and break them. The first 12" - 18" of almost all of my seams needed some attention.
Its a camper, therefore it leaks.