Version 1.4 of Elementor introduced the Elementor Canvas blank page template as well as the Maintenance Mode options.
This video shows how to use both to set up a Coming Soon page for your WordPress website.
Elementor Pro is used for the Countdown timer and GeneratePress is used as the theme.
As mentioned in the video, here is a further explanation of the two modes:
If you pick Maintenance mode, the website will return an HTTP 503 response to visitors and search engines, meaning the site is temporarily down for maintenance, come back later.
If you pick Coming soon, the website will return an HTTP 200 response to visitors and search engines, meaning the site is indexable.
Link to Elementor post: Introducing Canvas: Native Blank Page Template