Check IF is a “single product page” and Check the “role” for a Redirect

Here is the result that works, I put in the condition : is_product() to check if is a single product page.
And I changed in the add_action() : admin_init by wp

function cm_redirect_users_by_role() {

    $current_user   = wp_get_current_user();
    $role_name      = $current_user->roles[0];

    if ( is_product() ){
        if ( $role_name !== 'customer' && $role_name !== 'shop_manager' && $role_name !== 'dc_vendor') {
            wp_redirect( 'https://www.mysite.fr/' );
        } // if
    }
} // cm_redirect_users_by_role
add_action( 'wp', 'cm_redirect_users_by_role' );