Two questions:
1. Is this adventure on the Slow, Medium, or Fast advancement rate?
2. When the adventure says "award the PCs 600 XP" for story-based rewards, is that 600 XP each or 600 XP divided evenly between PCs?
For the first question: Starfinder only has one advancement table, so you use that one. I think it corresponds to the fast table in Pathfinder.
The XP is divided.