If I am at 7, opponent is at 6, captures both battlefields, then on my action I conquer the open battlefield, as they were conquering their 8th point, I ride the wind. Do I get to 8 first?

No, you do not win the game by reaching 8 points this way.

According to Rule 448.1.b.2 and the associated RiftJudge FAQs (such as FAQ #198 and FAQ #320), you cannot win the game by conquering a battlefield on your opponent's turn if you are at 7 points. To win via a "Conquer" action when you are at 7 points, you must score on every battlefield in the same turn.

Here is the breakdown of why this does not result in a win:

1. The "Final Point" Restriction: When you are at 7 points, the final point (the 8th point) has strict requirements. If you are attempting to earn it through a "Conquer" action, you must have scored on all battlefields during that turn.
2. Turn-Based Scoring: Because you are performing this action on your opponent's turn, you cannot satisfy the requirement of scoring on all battlefields within the same turn. Even if you successfully conquer the battlefield using Ride the Wind, you will simply draw a card (the standard reward for a conquer that does not result in a point) rather than gaining the 8th point.
3. Timing: Even if you were on your own turn, the game state would resolve based on the order of operations. However, the fundamental rule is that you cannot reach the 8th point by conquering a battlefield on an opponent's turn unless you have already scored all other battlefields during that same turn cycle.

In summary, while Ride the Wind allows you to move and potentially conquer a battlefield on an opponent's turn, it cannot be used to bypass the requirement to score all battlefields in a single turn to reach the 8th point. You will draw a card for the successful conquer, but you will remain at 7 points.