SIMD/NEON in Stable Rust?

I'd like to "reuse" this thread to ask about the state of SIMD/NEON in general.
I found several github issues related to this:
https://github.com/rust-lang/stdarch/issues/148
https://github.com/rust-lang/rfcs/pull/2977

I'm confused about how to approach the issue. Should I use nightly rust only? Any 3rd party crate? Should I wait for them to be merged to stable? How can I know the list of supported intrinsics ?