I have a newly tiled shower that was put in with a metal edging piece.
However you can still see the edge of the cement board underneath it where it meets the wall.
How do I finish this?
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If I understand correctly, the question is how to finish the 90degree transition where the metal trim meets the drywall.
First, I would clean up the metal trim. Scrape off or use some kind of adhesive remover to remove any residue. You may need to buff/polish it with some fine grit sandpaper.
For the transition i would use caulk, If you feel it may see a lot of moisture then use 100% mold/mildew resistant silicone. (after painting the wall)
If not then a paint-able caulk (before painting the wall) that would be able to accept the paint color you choose for the wall.