If U.S. national sovereignty continues, it is only as a state that Puerto Rico will have permanent 10th Amendment powers over its non-federal affairs, as well as voting power in Congress.
The powers of government exercised locally derive from a federal law authorizing government by consent in local affairs only, unless those affairs are otherwise governed by federal law.
The capacity of the commonwealth government created under the local constitution to exercise governmental powers in local affairs is like that of local government in the states of the union in regard to non-federal affairs at the local level.