@Anonymous:
I agree with @jaylou but would like to add that you might want to set some type of a flag in the source list to indicate that the task list has already been populated. Otherwise, you could end up with multiple entries in the task list if the source list is updated before the status is changed again.
By a flag, I mean a column that you set to indicate that the task has been created - usually a yes/no column. For example, at the top of your Flow, check the value of your flag. If it is set to yes (default is no), exit the Flow. Otherwise, continue. When you create the task, set the value of the flag to yes.
If you need an example, let me know.
Scott