Correct https redirect via .htaccess?

Question

htaccess

Now (before installing https) on the site there is such a code in .htaccess

RewriteEngine On
# Redirect from www to non-www (never use both)
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteRule .* http://%1/$0 [R=301,L]

How to change it correctly for a site with https now.

Website: https://smofast.com
Now there is a redirect, but it's not in htaccess - maybe then remove all those lines above?