Bula!
I should say that I have not been up to Taveuni since Cyclone Winston, but I have asked people working there. The general feedback I have had is that the signature dive sites like the White Wall and Rainbow reef are largely intact and still fabulous. The shallower reefs did not fare so well and are, in many places, badly damaged. I suggest you contact the resort dorectly and ask their view. Qamea island was hit hard by the storm. The resort has rebuilt but I would be amazed if the shallow reefs were ok, but please go with someones view who has snorkeled there post storm.
If you wanted to stay somewhere prior to your husband arriving, I would suggest somewhere like Leluvia for a value for money option with good snorkeling Travelling further might be a bit much for a week, but look at Matava on Kadavu, which avoided the storm entirely or Mai Dive for a more upmarket option. Have a great trip.