Snippet to define a custom date format to show Estimated delivery using the PluginHive's Estimated Delivery Date plugin for WooCommerce : https://www.pluginhive.com/product/estimated-delivery-date-plugin-woocommerce/

functions.php

/**
 * Snippet to define a custom date format to show Estimated Delivery Date
 * Created at : 16 Aug 2021
 * PluginHive Plugins : Estimated Delivery Date Plugin For WooCommerce
 * Gist Link : https://gist.github.com/PluginHive/7fb8f48c6b6f1d30d33ad50cb1a37c2b
**/

add_filter( 'xa_change_estimated_delivery_date_format', 'ph_change_estimated_delivery_date_format' );

if( ! function_exists('ph_change_estimated_delivery_date_format') ) {
	
    function ph_change_estimated_delivery_date_format( $date ) {
		
	global $wp_version;

	//Give the desired formate here.
	$format = "l F d Y";

	if ( version_compare( $wp_version, '5.3', '>=' ) ) {

		if (date_default_timezone_get()) {

			$zone 		= new DateTimeZone(date_default_timezone_get());
		}else{

			$zone 		= new DateTimeZone('UTC');
		}

		$formatted_date = wp_date( $format, strtotime($date), $zone );

	}else{

		$formatted_date = date_i18n( $format, strtotime($date) );
	}
		
        return $formatted_date;
    }
}