I believe that “seeing His glory" means, in essence, to be acquitted and restored.
The Scriptures explicitly reveal that one of the means of knowing God involves being exposed to His ways (Ex. 33:13). It appears that God’s glory is exhibited in His character. In Exodus 33:18-22 Moses asked God to “Please, show me Your glory.” Then God said, ‘“I will make all My goodness pass before you, and I will proclaim the name of the Lord before you. I will be gracious to whom I will be gracious, and I will have compassion on whom I will have compassion.’ But He said, ‘You cannot see My face; for no man shall see Me, and live.’ And the Lord said, ‘Here is a place by Me, and you shall stand on the rock. So it shall be, while My glory passes by, that I will put you in the cleft of the rock, and will cover you with My hand while I pass by’” (cf. Ex. 34:5-7).