Uses the gform_confirmation hook to display a text confirmation message before triggering the redirect confirmation.

gf-dual-confirmation.php

<?php
// Copy everything below this line

/**
* GravityRanger Dual Confirmation (text + redirect)
* https://gravityranger.com/display-text-confirmation-before-redirecting-gravity-forms
*
* Uses the gform_confirmation hook to display a text confirmation message before triggering the redirect confirmation.
* This code is a modified version of the snippet provided on docs.gravityfroms.com
* 
* @instructions:
* 
*  1. Add this code snippet to your functions.php file or a functionality plugin like WPCodeBox
*  2. Enter your form ID number(s) on line 31
*  3. Edit the confirmation message on line 40
*  4. Set how many seconds you want the redirect to be delaied on line 42 (2000 = 2 seconds)
* NOTE: This only works if your default confirmation is configured as a redirect
*
* 
* @version  0.1
* @author   GravityRanger
* @license  GPL-2.0+
* @link     http://gravityranger.com/
* @credits  https://docs.gravityforms.com/gform_confirmation/
*
*/

add_filter( 'gform_confirmation', function ( $confirmation, $form, $entry, $ajax ) {
    GFCommon::log_debug( __METHOD__ . '(): running.' );
 
    $forms = array( 5, 16, 43 ); // i.e Targets forms with id 5, 16 and 43.
 
    if ( ! in_array( $form['id'], $forms ) ) {
        return $confirmation;
    }
 
    if ( isset( $confirmation['redirect'] ) ) {
       $url          = esc_url_raw( $confirmation['redirect'] );
        GFCommon::log_debug( __METHOD__ . '(): Redirect to URL: ' . $url );
        $confirmation = 'Your message has been received loud and clear. Please standby...';
        $confirmation .= "<script type=\"text/javascript\">
	setTimeout(function() { window.open('$url')}, 2000); </script>";
    }
 
    return $confirmation;
}, 10, 4 );

Awesome, thanks Chris! How could I use this in the "Save and Continue Email Sent Confirmation" instead of the default submission confirmation? Any guidance would be really appreciated. Thanks again!