So Egypt was continually proving to Israel, to Jehoiakim and to Zedekiah. The tenses are present not past.
To be at a stand - Others, “to totter.”
Related Commentaries of Ezekiel 29:7
Ezekiel 29:7
7 When they took hold of thee by thy hand, thou didst break, and rend all their shoulder: and when they leaned upon thee, thou brakest, and madest all their loins to be at a stand.