Hahaha, I bet your principal wouldn't be chuffed with your post!
By no means all schools close for No 3, tho yours surely among them.
My guess: yes, Number 3 will be in effect tomorrow. Megi taking its time to go anywhere, tho still seems bound for e Guangdong. So still chance of strong winds, but gales and above not so likely without a shift to northwest (I've seen notions a northwest shift, later, is possible).