It’s probably more relevant for Australian businesses (and uk & nz, based on subscribers) but Xero does have a project that releases statistics about overall business health and the economy from a SMB perspective.

https://www.xero.com/small-business-insights/

Again, it’s likely to undercount low / no-tech businesses and over count those that were already looking towards technology as a differentiator (having decided to move their accounting to the cloud)