It's about time we updated our software.
【we updated our software.】是省略了that的定语从句吗?
一般不都是用It's about time to do sth吗?
【we updated our software.】是省略了that的定语从句,该定语从句的谓语动词通常用一般过去时。It's about time ... = It's high time ...例如:It's about time our team won. 是我们队该赢的时候了。(摘自《朗文高级英语应试词典》)