Yes. A 30W is actually necessary for the fastest possible charge as the iPhone will pull 27W if it’s under certain charge percent. In any case, the iPhone self limits its power draw to avoid battery damage. If you’re using an Apple power adapter, or anything reputable that uses the Power Delivery protocol, you’ll be fine.
The therapists at my hospital all seem to like theirs. Perhaps look for a refurb SE to try it out (relatively) inexpensively.