Telstra kicked off RCS in Australia, but only on their network, then Google did one for everyone else, but it doesn't work with Telstra AFACT.
Vodafone has this business RCS page:
https://www.vodafone.com/business/carrier-services/messaging...
and they "launched" in 2018, but from what I can tell still no-one is using it.
There's a lot of confusion around it.