You can wait.

With CYA > 200 ppm, an appropriate chlorine level is going to be in the orange tinted range (chlorine > 20 ppm).

Right now, you just want to avoid algae, while waiting for the kit, and good data. As long as the pool is algae free, you can swim. I wouldn't recommend wearing a new $100 swimsuit when you do, however.

However, watch out for eye and skin irritation: swim 10 minutes for the first time, and then wait and see. Sometimes, by products of CYA loss can combine with chlorine to form some irritating chemicals, and you don't want to spend 2 hours in the pool, and then pop-up with 'hives' 2 hours after you get out. (It's not a real allergy, but it feels like one!)