Best way to tell is to look in your fuse box under the hood for a fog light relay (The cover is marked to tell you which one). I would suspect it's probably not prewired.
You can wire them into the low beam side of the headlights, but you should put a relay in the circuit so you're not drawing extra current on your headlight circuit. You'd still need to run another circuit for the halo rings.
Best thing to do is just tap them off the battery and run new wiring and a switch into the cabin. Most halo fogs come with a three position switch for off/halo/fogs and they come with the relay and harness to wire them. It's a pretty easy operation.
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