Currently Kia is one of the least affected car manufacturers in terms of supply issues, hence they’re now the number 2 car manufacturer in the UK by volume.
However, they still have problems eg they’ve stopped taking orders for the Sorento as they can’t get parts.
As for not being able to give accurate lead times, the problem now with supply chains is that no one can give accurate lead times for parts, so you plan to what your suppliers have told you and then they come back and say 8 wk slip on this batch of chips the day it was supposed to arrive.
It’s pretty much impossible to accurately forecast anything with chips in them at the moment as the whole supply chain is broken.