The branches are perfectly fine.
After your graft, you expect some active growth to heal faster. This might be better to do next spring. Several things will be better: the branches will be wooden, the growth is expected, easier to collect the nice varieties over the winter, warmer temps ahead in the summer.
The best time is when the fig is out of dormancy and starts growing. I also think it is better when the scions start pushing the leaves, just start them in a moss bin.
When they are ready, cut the bottoms off the way you like it and graft them!
The success rate for fig grafting is quite high. Good luck!