The relays still work, the mechanisms to share the relay addresses have changed a bit and continue to do so. Tor's traffic looks like regular https traffic so it's very difficult to block. The tor project makes China one of it's priorities and continually play an escalation war with China's government.

So if it does get blocked its not for long.

I wish I could help you with more specific information off the top of my head, but I fortunately don't have to use relays. I am willing to do some research and share the results here if you like.