I have been checking frequently and was pleasantly surprised yesterday when I see it appear in the list of services that works with Google.
Setup was a breeze although a little weird. Even though I have already assigned names to the indoor units in Daikin Mobile Controller app and the names corresponds with the rooms list I have in Google Home, it still asked me to assign the units to a room. And the funny part is that some are automatically assigned and some don't.
It doesn't matter as you can just add them to any room first and then simply move the units to the right room once the account is successfully linked.
If you select the unit it will show only the on/off option and nothing else.
But if you have a Nest Hub, it will show up more control options. In fact you can also voice control it by giving out voice commands to a Google Assistant supported devices like the Nest mini or even an Android TV. Your command has to be clear and specific though.
Initial tests have been positive. The response is immediate, as it it was local, and way faster than using 'Out of Home' function in the Daikin Mobile Controller app.
Will update this post once I have more time with it.