I contacted support about a month ago and they said they are still in active development on it, but had no time frame.
With that said, a SmartThings community member has recently integrated Tempest with their weather Edge Driver. It’s not an official WeatherFlow/SmartThings integration, but it does work. The caveat is that it does need you to install a basic proxy server. SmartThings does not have the ability to make HTTP requests outside of the local network, so it needs this proxy server running on your local network to forward/receive data to/from WealtherFlow. More details and instructions are here GitHub - toddaustin07/edgeWeather: SmartThings Edge Weather driver
I posted another thread on here with some screenshots showing all that is accessible SmartThings Integration Available
I’m still hopeful WeatherFlow will follow through with an official integration though.