I have a Zooz ZST39 800LR USB stick. But I don’t think that matters…
Aside from exposing the climate domain to Google, the key thing about getting the TBZ48 to work properly with Home Assistant and Google Assistant is that you must use Z-Wave JS UI - not the default Z-Wave JS - so you can configure the thermostat to use Association Group 1 - so that Google (as well as your Dashboards) will see the current temperature, any setpoint changed at the thermostat, and also the thermostat operating state (heat, idle, etc).
If you’ve already installed Z-Wave JS, see these instructions to add Z-Wave JS UI.
Once you’ve done that, see this note for instructions on setting the Association Group.
I hope this is helpful.