They released a beta firmware a while back. You can download it here. Be sure to read through that thread (currently 12 pages) to see what issues people have been experiencing with it....

@Kevin_Z I bailed on TP-Link. Couldn't wait any longer. Got a mesh system from a competitor and it's been about a week or so and everything's been solid. Sorry, TP-Link. I really did want to stay...

@Kevin_Z I've tried to hold out for the AX11000 OneMesh firmware but I can't wait any longer. I'm going to have to ditch this router and go with another mesh system. It's pretty disappointing that...

@roso I agree, I would even take something like "4th quarter 2020" for each router instead of "Planned". "Planned" tells me that it's not actively being worked, but is in the pipeline somewhere. It's...

@Thomasthetank Yeah, definitely waiting on this. The routers are listed as "Planned" but hopefully the website is just behind.

A timeframe on when the AX11000 will get OneMesh would be nice. Turns out this router isn't powerful enough to reach the other end of my house and I would prefer to just add another TP-Link router...