I always say to add salt & pepper to taste because I know salt is a sensitive seasoning for many people.
And the amount you use depends on if it is sea salt, kosher salt, table salt or salt substitute.
So when adding salt & pepper, just keep adding a little at a time and stir, then taste after each addition until it gets up to the seasoning level that is right for you and your family.

Cover and let soup simmer on low-medium heat for about 30 minutes to let all the flavors blend.