Probably get it in place of the standard security update. I presume the vendor layer is being updated as well, and likewise with other Nokia models. They really need to have a generic Nokia build of Android 9.0 like the GSI's on XDA. These even allow for customisation like ArrowOS etc. By having a generic OS updates can be pushed much quicker since it would be the same update across all models, updated thusly congruent. Vendor layer updates can be applied separately.