After Scott finishes then his Defence Counsel may call other witnesses - although I suspect not, as I think all the relevant people have been called already by the Prosecution.
If he finishes today or early tomorrow then there is time for Sarah to give evidence tomorrow and Friday.
That would mean closing arguments and Judge's summing up on Monday and Tuesday next week, with the Jury going out mid week.
The Jury will very likely return both verdicts at the same time. I think I have only followed one case where a verdict against one accused was brought in and the Jury then continued deliberations on the second accused.