I do not think you need to remove them.I just read on another page that I should be concerned about the bark from the wood chips breaking down and causing aspergillus?? They are only used in the covered run, not in the enclosed coop area. Pics attached of our run with the chips.
Is this ok or should I remove them?
How deep are they?
It's better when they are aged, but this time of year in your climate you should be fine.
If they were just cut and chipped, no leaves so much less 'wet' in the mix.
The cold weather will also tamp any mold blooms down, probably way down.
The aspergillus issue that I think you may be referring to was extreme and a totally different scenario than yours.
Read the whole story here, it's a good discussion about how mold blooms can happen:
https://www.backyardchickens.com/threads/dying-chickens.1129854/