How to get updated data when save_post triggers?

Question

I’m going to post this as an answer, because it worked for me:

function my_awesome_func ($post_id, $post, $update) {
    //update the value we need early
    update_post_meta($post_id, 'my_meta_key', $_REQUEST['my_meta_key']);

    $newValue = get_post_meta($post_id, 'my_meta_key');
}
add_action( 'save_post_my-custom-post-type', 'my_awesome_func', 10, 3 );

You could also simply use the value of $_REQUEST[‘my_meta_key’] directly if that works, but for my sake I wanted to update the post immediately so I could get the value via another function, not use the value immediately.