To measure the success of your product tour, look at metrics like user engagement, feedback, and conversion rates. Check how many users complete the tour, which parts they spend the most time on, and where they might drop off. Collect feedback through surveys or direct conversations to understand what users liked or disliked. Finally, track any increases in user activation, retention, or other key performance indicators. These metrics will help you gauge how well your tour is working and where you can make improvements.