Tex. Code Crim. Proc. art. 46B.114
If the hearing is not conducted at the facility to which the defendant has been committed under this chapter or conducted by means of an electronic broadcast system as described by this subchapter, an order setting a hearing to determine whether the defendant has been restored to competency shall direct that, as soon as practicable but not earlier than 72 hours before the date the hearing is scheduled, the defendant be placed in the custody of the sheriff of the county in which the committing court is located or the sheriff's designee for transportation to the court. The sheriff or the sheriff's designee may not take custody of the defendant under this article until 72 hours before the date the hearing is scheduled.
Tex. Code Crim. Proc. § 46B.114