If a defendant who was found under section 3 of this chapter to have had a substantial probability of attaining the ability to understand the proceedings and assist in the preparation of the defendant's defense:
the state institution (as defined in IC 12-7-2-184) or the third party contractor, if the division of mental health and addiction has entered into a contract for the provision of competency restoration services by a third party, shall institute regular commitment proceedings under IC 12-26.
IC 35-36-3-4