Most houseplants, including your Ficus Lyrata, are tropical in origin and non-seasonal. That means you can repot and prune at any time of the year.
The exposure of some surface roots is not a cause for concern. If your plant has enough soil to retain water for 3 days or more, there is no need to move it to a larger pot. It certainly looks healthy enough. If you do repot, move it to a pot one size larger and add potting soil to the bottom and sides, but not on top. Remember to reduce your watering frequency after you repot.
The nursery grower put two plants together on purpose to create a fuller plant. Lyratas don't reliably send out side branches and tend to just grow ever taller. Trying to separate the two plants whose roots are completely entwined is not recommended. I do recommend regular pruning to keep the plant looking manageable. Pruning will also sometimes promote side branching.
