Well, it is true that the Catholic Church is not a building. It is the Body of Christ himself, as the Holy Scripture clearly teaches.
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I’m curious annalex...what are you being taught about end-times? HOW much do you know to watch for? We were told to watch. WHAT are you watching for?
That we should be ready any time. Regardless when Christ comes for all, our encounter with Him is mere decades away at most, and may be just minutes away. It is important to grow in holiness at all times. It is unimportant and even harmful to speculate about the day and the hour. That is about it.