I have already picked a squash. Even at baseball size, they already have large seeds inside. If you like that texture, great, but I will be hollowing them out before I cook them next time.
Oh another note on the squash: I have needed to pollinate them with a paint brush. The bees are not finding their way into the greenhouse despite having 2 vents open 24/7. The flowers are closed by 9 am so I need to rush out there and pollinate. I have lost a lot of fruit in figuring this out!
Here are the melons. The watermelons (left vine) are still catching up and have a few flowers, but the cantaloupes (right 2 vines) have developed 2 fruits: