We should know without a doubt whether it is workable by 2050, perhaps before then.
I strongly recommend the book "The Future of Fusion Energy" as a good summary of the current state of the field. It's written by two fusion researchers and is legit (I have a Master's in Physics myself and almost did a Plasma Physics PhD so I am somewhat familiar with the field).
The book isn't dry either, it's honestly one of the best books I've read in years.
Another one that is also very good is "The Future of Fusion Energy" which has lots on modern methods.
Also well worth checking are the podcasts 'Physical Attraction' which has done many episodes on fusion and 'Omega Tau' that has long episodes on ITER, Wendelstein 7X and superconductors.
Perhaps you mean this?
Chapter 9 has a comparison of alternative approaches. There are figures of the triple products for various systems.
Perhaps Figure 9.10 from the book ?
By the way the book is well worth a read. Bit pricey in print but the Kindle versions are reasonable.
That is it indeed, thanks!