client.key, client.crt, ca.crt and ta.key (if you have).
client.conf if your client is based on Linux, client.ovpn if your client is based on Windows. You didn't mention that.
Find a table with all files and where they should be and if they are secrete or not:
https://openvpn.net/index.php/open-source/documentation/howto.html#pki
Greetings
Martin