Datorama Reports - Journey Performance is where leadership at NTO should find the dashboard showing the success rate of customers that have been through a Welcome Series Journey in the last 7 days. Datorama Reports is a feature that provides advanced analytics and insights for Marketing Cloud journeys. It allows you to create custom dashboards and reports that measure the performance of your journeys based on various metrics, such as engagement, conversion, revenue, etc. You can also filter your data by time range, journey name, version, status, etc. Journey Builder - Journey History shows the history of journey versions, activations, and deactivations, but not the success rate of customers. Reports - Journey Engagement shows the engagement metrics for a specific journey version, such as sent, delivered, open, click, etc., but not the success rate of customers.