This code might work for you
add_filter( 'woocommerce_cart_calculate_fees', 'add_recurring_postage_fees', 10, 1 );
function add_recurring_postage_fees( $cart ) {
if ( ! empty( $cart->recurring_cart_key ) ) {
remove_action( 'woocommerce_cart_totals_after_order_total', array( 'WC_Subscriptions_Cart', 'display_recurring_totals' ), 10 );
remove_action( 'woocommerce_review_order_after_order_total', array( 'WC_Subscriptions_Cart', 'display_recurring_totals' ), 10 );
}
}
This will filter the hook woocommerce_cart_calculate_fees.