Change "Howdy Admin" in Admin Bar

wp-replace-howdy.php

<?php
/**
 * Customizes the WordPress admin bar greeting text.
 *
 * This function replaces the default "Howdy," text in the WordPress admin bar with a custom greeting text.
 *
 * Usage:
 * - Edit the value of the `$new_howdy` variable to set the desired greeting text.
 *
 * @param WP_Admin_Bar $wp_admin_bar The WordPress admin bar object.
 *
 * Gist Keywords: wordpress, customization, admin
 *
 * @category WordPress
 * @author   Knol Aust
 * @version  1.0.0
 */

function knolaust_replace_howdy( $wp_admin_bar ) {

	// Edit the line below to set what you want the admin bar to display instead of "Howdy,".
	$new_howdy = 'Welcome,';

	$my_account = $wp_admin_bar->get_node( 'my-account' );
	$wp_admin_bar->add_node(
		array(
			'id'    => 'my-account',
			'title' => str_replace( 'Howdy,', $new_howdy, $my_account->title ),
		)
	);
}

add_filter( 'admin_bar_menu', 'knolaust_replace_howdy', 25 );