"I may be wrong, but I do not think this is done.

My system has very large tables with 30+ M rows and I often add columns
to it.

The procedure you mentioned only applies when you are dropping a
column. Also, you have to perform these steps manually. "

I performed the 'adding column' procedure from control center. In the
end of it, I got the pop windows which showed all the steps in my post.
Also I did see there's a temp table which has the same structure and
data during the process.

The version is the latest one: 8.2
You can give a try also.