After attempting to join Salesforce tasks to opportunities via the `what_id` field, we found no matching records—tasks’ `what_id` values do not align with opportunity IDs in our data. Without a clear foreign‐key relationship linking tasks to deals, we cannot compute a timely‐completion rate per deal or assess whether on-time task completion correlates with deal success. Thus, with the current schema and data, this analysis cannot be performed. If you can provide or establish the proper linkage—such as a mapping from `salesforce_tasks.what_id` to `salesforce_opportunities.id`—we can revisit the correlation analysis.