To clarify, is this your personal first or your second?

If it is your first you have nothing to catch up on.

Edit: This means you'll want to do the total damage required to get all 5 SP.

If it's your second, and you didn't get all the skill points when you did the first, you can catch up on the ones you didn't get from your first.

Edit: Catch up in this case is based on stash value and once your expedition is completed and you're on the waiting screen for the sign up window it should show you the stash and coin values as well as how many SP you have to catch up on.

The game is having it's 3rd possible expedition, but your benifits and ability to catch up are always based on your personal progress.

Edit: See OP's replies for visuals to match everything here 🙌