Yeah, and the sewn in long pockets are for some sort of frames. I've used 1 1/2" PVC. Stiff folding FG tent bows might work. long battens too but pricey. these frames keep it up where it doesn't block movement, wind or visibility. Looks good too.
Need to protect the mainsail and cover from chaffing with rags or old towels as the tent (it's called a boom tent) will move around some.
Should be a d ring or 3 sewn in the top to sling it from the main halyard and grommets for running lines to the lifelines.
These things are fantastic when not using the main for shade/rain protection in the cockpit and keeping things cooler below.
I don't have one for this boat, yet.