Here's a website where they're putting up data from the borehole.

https://deepgeothermalheat.engineering.cornell.edu/research/

Note the wireline logs. You can see the radioactivity (which is where the heat comes from) go way up as they reach the crystalline basement rocks.

The technical issue that's going to determine if this is feasible is how quickly water from an injection well can get to a withdrawal well. This depends on the how fractured the rocks are.