KuCoin's representative on Reddit replied that they don't have an ETA for the upgrade period, in addition, they will also inform their users ASAP if the token upgrade has been completed. So, I think you should wait a little longer.
There's no announcement yet about the upgrade it's not done yet.
@OP According to Kucoin all services for RNDR are Temporarily Closed! if you see a balance you won't be able to do anything until the upgrade is done.
You can read the latest Kucoin announcement here
KuCoin Will Support the Render Token (RNDR) Upgrading to Render (RENDER) you better wait for 1 more week.