Mine are mostly still growing. A few have set fruit, but most are behind. If you're in the southeast you've got a fair amount of time till the first frosts - a good 3.5 months so I wouldn't worry yet. Personally I don't trim squash vines, but this year the slugs have been doing it for me anyway. If you want big fruits, just remove the ones you don't want - the plant will need its leaves to grow the squash.