The high-performance gaming variant (Xe-HPG) has not been released so we don't know if it's any good.
The real question, though, is what sort of performance Xe HP/HPG/HPC will bring when they're released. They don't need to significantly outperform the competition (AMD has more than demonstrated in the past that superior GPU performance alone is not enough), they just need to be close enough with a good enough software story. Cuda and Nvidia's driver stack are both reasonably nice and a pain in the ass to work with, so if Intel can (1) competently support major ML frameworks, (2) reasonably support porting from Cuda, and (3) maintain a competent OpenCL implementation that could be enough to be competitive. They'll likely eat market share from AMD first, since the AMD software stack has more rough edges.
Hopefully there's some way to get it when it's released
According to videocardbenchmark.net Intel Xe graphics are about 20% faster than the GT1030, that currently leads in the world of single slot low power GPUs
I don't care if it's 20% slower than the GT1030 if I can browse the web in firefox under KDE with default settings! Since I replace my graphics card less often than I replace my CPU, I would pay a premium for such a device.
Edit: just saw you said discrete. Oops.