If they can advance far enough on the plains surrounding Kherson while being shelled and airstriked. There's no cover. It's built on a flood plain across the mouth of the Dnieper.of all russian held territories, Kherson stands the best chance of being recaptured by Ukraine. with sufficient fire power Ukraine could conceivably destroy the two bridges Russia holds over the Dniepr in order to cut its lines of communications.
At that point the river is narrow. It can be pontooned, and destroying bridges is very hard. US failed to destroy Thanh Hoa Bridge in North Vietnam multiple times and lost 11 aircraft trying despite the full might of the US air force and naval aviation.
After being hit by laser guided bombs in the last attempt, it was repaired within 1 year.