The Chapter regulating the J&DR courts specifies that at the end of family abuse proceedings, a J&DR court can issue a permanent restraining order lasting up to two years and that this can be extended prior to its expiration.
Va. Code § 16.1-279.1(B).
It also provides for enforcement of the order through contempt proceedings, implying the court can remain seized of a case to enforce its orders over a case that is over.
I don't think the current incest charge counts as that, although they could always cut a deal where he pleads to some minor domestic battery to let him avoid the motherfuckery charge.
In that event, he wouldn't be under the supervision of the probation department or in prison, but he would be subject to a permanent restraining order subject to renewal and potential criminal contempt charges if he violates it (and of course the federal gun rights revocation that entails).