How to Add last updated date in page hero

hi,
I have this css on my site and showing last updated date. I use page header hero but it does not display "last updated". It displays post date. I have found this link but I am not sure if it is what I am looking for. Thanks

https://docs.generatepress.com/article/show-the-updated-post-date/

.posted-on .updated {
display: block;
}
.posted-on .published {
display: none;
}
.posted-on .updated:before {
content: "Last Updated: ";
}