JCE GPU is on Win64 only.
I don't know if i'll release a Linux version. On CPU version, linux users are like 5% of total, not good to be motivated. And Linux miners are a lot more rare than Windows ones.
There's much more big time miners with GPU rigs running on Linux than you think. They don't like to babysit 24/7 like you have to do with Windows. That's also where most of the hashes could hit your miner because they do like to scale things way too much
You can't see them on the CPU version because they don't mine with CPUs to get 100 more hashes. People who you can see on the CPU version are just using old hardware to squeeze a few extra hashes from their old laptop, not a serious miners.
There's so many miners saying if they can get 2K hashes on Cryptonight from Vega they would switch back to Linux in seconds. I personally use my Vegas on another algos just because I'm not planning to use Windows even if I can make a few more bucks in a week. No thanks.