Glorification always means the same. Firstly it is always something’ that is visible, obvious, undeniable. Secondly, the aspect that we ‘see’ is something beyond of, well outside of the capability of whatever we ‘see’ the glory reflected in. Which is another aspect, Glory is reflected, that is, God reflected.
If Glory is seen in ‘man’, then something we see in that man is from outside of him. Be it ‘joy’, ‘a healing’, ‘provision’, and so on.
But, creation also reflects Gods Glory. Any ‘honest’ person looking at creation, or the universe instinctively ‘knows’ it didn’t ‘just happen’. So the Israelites could ‘see/sense/feel’ Gods Glory In ‘a cloud’ that supernaturally lead and protected them.
Now, Glory can also be reflected in a nation. Say one that provides a ‘solution’, or is supernaturally prosperous despite it’s physical environment. Or perhaps in the way it was ‘formed’ in just one day, overnight!
So in your verse, Isaiah is simply referencing the covenant God made with Abraham.
Genesis 12:2 I will build a great nation from you. I will bless you and make your name famous. People will use your name to bless other people.
Gods Glory will be seen through his nation. It will. Because this was promised.