Google has added Generative AI impression tracking [BETA] to search.google.com. It’s just impressions based, which is logical, but still hugely useful as you can see what’s being picked up and identify where client content could rank for relevant queries.
Note: They’re only rolling it out to a subset of accounts to begin with.

SEO is as important as ever, the surfaces have changed but the foundations remain the same. I have more detail on how to write prepare content that ranks here.