I created an alert for the sold estimate, and the zap is triggered from the alert hitting my email. I use it to create a task.
Are you trying to trigger this for one particular job type? I have found a workaround that triggers every time a job is completed in our sales business unit with the job type "Investment Opportunity." This triggers a Zapier filter to then create a new Trello card and a task inside of Task Manager for pulling a permit.
Here is a link to my Zap...feel free to have a look and give me some feedback on how it worked for you or improvements that should be made to it!!