Is it wine yet?

No. More like Grape Soda. It’s comfortably fizzy, but not overwhelmingly so. I was worried it might taste like too-old fermented orange juice, but it doesn’t have that twang. Nope, after 48 hours, it’s tasty Grape Soda.
Mainly, I’m glad to have survived the experiment. The box says that if you leave it longer, it will get stronger and drier, so we’ll test that idea and keep you informed.