How to update user meta when buddypress profile is updated

I am able to update user meta when user signs up using buddypress registration page.

But i don’t know how to update user meta when profile is updated.

i am using below code to add/update user meta when user signs up.

add_action('bp_core_signup_user', 'ad_user_signup_usermeta', 10, 5);
function ad_user_signup_usermeta($user_id, $user_login, $user_password, $user_email, $usermeta) {

     update_user_meta($user_id, 'first_name', $usermeta['field_2']);
}

can someone please suggest the correct hook and method to update user meta when profile is edited/updated.