Arizona, California, Florida, Massachusetts, Nevada, New Hampshire, New York, South Dakota, Tennessee, Texas, Washington State and Wyoming are participating.
It’s a shame more aren’t participating but I can see the reasoning behind staged access and iterative improvement. The real pity is that data they’ve already got won’t be preloaded in this stage. It would have been the nail in the coffin for Intuit and other companies’ predatory practices on lower income folks, at least as they exist currently.