PRE LAUNCH

Check sitemap (if you added cpt you have to add them to the sitemap aswell). Go to /sitemap.xml
Test the site in lighthouse, make sure you meet the standards for accessibility etc.
Check the settings for yoast (maybe add variables to autofill meta description)
If you added your own custom post types make sure these are also generated in getstaticpaths in the […slug] component.
Add BUNNY-CDN for images? Ask Antonio.. make sure you use the CDNImage component for all images from wp regardless (it will work even though if dont activate bunny)

LAUNCH

Change domain in vercel if not already moved.
Check all vercel variables if site is password protected then remove NEXT_PUBLIC_MAINTENANCE_MODE variable from production.
Change the settings for WP_HOME and HEADLESS_MODE_CLIENT_URL in wp-config on live server (backend)
Save permalinks
Replace old front end url with the new one by doing:
wp search-replace 'oldurl' 'liveurl'
Retrigger build on vercel
Check that the sitemap shows the right url values.