How can i show only the cheapest shipping rate at checkout?

function my_only_show_cheapest_shipping_rate( $rates, $package ) {

	$cheapest_method = '';

	// Loop through shipping rates
	if ( is_array( $rates ) ) :
		foreach ( $rates as $key => $rate ) :

			// Set variables when the rate is cheaper than the one saved
			if ( empty( $cheapest_method ) || $rate->cost < $cheapest_method->cost ) :
				$cheapest_method = $rate;
			endif;

		endforeach;
	endif;

	// Return the cheapest rate when possible
	if ( ! empty( $cheapest_method ) ) :
		return array( $cheapest_method->id => $cheapest_method );
	endif;

	return $rates;

}
add_action( 'woocommerce_package_rates', 'my_only_show_cheapest_shipping_rate', 10, 2 );
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