Current Status of SLI in >5.0 Kernels?

As I gather, SLI is not working in Kernels > 5.0…Is there any idea why & is there any timeline to correct the problem?

IDK, but (not only) my opinion on this is that SLI is a dead(end) technology which is likely to be dropped in favour of DX12/Vulkan explicit MultiGPU. There’s an article from an nvidia dev somewhere on the nvidia website explaining this rather frankly in-depth, nice read.
Taking into account that SLI on Linux was always rather a PITA than useful at all, let it rest in peace.