Actually, there has been good progress, with the performance of the devices improving by about a factor of 10 every decade since the 1950s.
Based on that trend, we should have working prototypes in another decade or so, but the effort is desultory at best. The international centerpiece of fusion is the ITER reactor in France. It was supposed to be ready by 2010, now expected to be finished by 2025, with the first real fusion experiments around 2035 - 2040. Basically a UN managed research effort, makes herding cats look easy.
The problem is that cheap gas and subsidized wind/solar drained any urgency from the search for more energy, so this is run as a hobby effort, no urgency at all. I've visited the ITER site, no weekend work, single shifts, a handful of workers, lots of visiting dignitaries and probably masses of administrators behind the scenes in Geneva and elsewhere.