Yes it is working on the Bitcoin mainnet. You can view some stats about lightning at https://1ml.com/ and https://graph.lndexplorer.com/

You can download and try out the desktop ZAP wallet. If you want to use online wallet you can try https://htlc.me/

You can connect to my hosted mainnet lightning node: 0387c1e8e5e83d77885a8e90682f1dfc922daf702ae56463e8bb5baba181ce52a7@173.249.2.209:9735