You can use wg show to check if a client is connected:
interface: Computer public key: X6NJW+IznvItD3B5TseUasRPjPzF0PkM5+GaLIjdBG4= private key: (hidden) listening port: 19628 peer: H3KaL/X94984cLDNWFsM4Hx6Rs/Ku0bW2ECkDUn7wFw= endpoint: 10.9.1.108:19628 allowed ips: 10.217.59.2/32 latest handshake: 27 seconds ago transfer: 13.19 MiB received, 12.70 MiB sent persistent keepalive: every 1 minute
Look for this line:
latest handshake: 27 seconds ago
If it’s less than two minutes old, the client is connected.
If the latest handshake line is missing entirely, the peer has never connected successfully!
If in doubt, you can often ping the client to verify. It depends on the client configuration and possibly firewall settings if it will answer the ping but it never hurts to try.