As of 23-Dec-2023 Webflow Localization doesn't localize CMS option fields.
I'd expect options localization to be solved eventually, and I'm not sure why it's not already supported. My best guess is that it's related to implementation issues in how options were built, and the extensive changes Webflow needs to make to easily support alt locales in option fields.
The simplest option is probably to replace your option fields with ref fields, as long as;
I generally prefer ref fields to options anyway for the added field support, sort order control, etc. However, currently options work ok for things like collection list filtering, so they can be a good lightweight choice.