What does Isaiah 18:4 mean?

Because this is what the Lord says to me: 'I will stay quiet and watch from where I am, like the heat shimmering in the sunshine, like a cloud of dew in the heat of harvest.' Isaiah 18:4 - Modern Text Bible

(God says He will wait and observe, not acting immediately, but His presence is still there, like heat or dew that you can feel but not see.)