It's not yet designed to produce net energy – it can't handle the necessary (radioactive) tritium fuel. Assuming it works as intended, the next step would be a

It's not yet designed to produce net energy – it can't handle the necessary (radioactive) tritium fuel. Assuming it works as intended, the next step would be a research reactor that can, that would be a pilot project to generate net energy which could be connected to the grid (probably more for symbolic reasons at that point…) and breed tritium for further reactors. Then we can start to plan building actual power plants. So, few decades, as always.