It’s hard to put a concrete date on something like this because it’s not one feature but rather a collection of features, tools, and integration patterns. But many people are working on getting there.
I need to finish this PR and then get it onto Statemint once it’s had some testing on Statemine. It also requires some of the tools that @IkerParity outlined in New Tooling and Infrastructure to facilitate the Statemint roadmap. And of course demos/documentation to show people how to do it.