You don’t need to worry. Maybe he isn’t a KJV-onlyist, doesn’t believe in the rapture, knows that christmas was originally pagan, isn’t a trumpist and knows the hebrew week - but nothing of it makes his “prediction” more reliable. It suffers the same flaws as if all of the mentioned points were the opposite.
In addition christian fundies often reinterpret the biblical language and the meaning of certain passsages as it fits their narrative - not too long ago pastor Robin Bullock claimed that if you read the Gospel of Matthew in its original hebrew Barak Obama is mentioned. Somehow the pastor was oblivious to the fact that the gospels have been written in koine greek, not hebrew - so if a fundie starts to talk about the actual meaning of the original wording he most likely is making shit up: In the passage about “nobody knowing the day and hour” the character Jesus mentions explicitly that members of his audience will be still alive when he returns - a passage which for some reason gets ignored by the doomsday phrophets time and time again. So the prophecy failed already at least 1900 years ago. Not to mention that the Jesus-character of the bible didn’t fullfill any prophecy about the messiah, with the one exception that he is jewish.
Nothing in the bible fits reality - there are anachronisms, impossibilities, traces of an older tradition when yahweh was one god of many, contradictions, outright lies, misunderstandings and a god who proves to be neither omnipotent nor omnipresent or omniscient on many occasions.
So the question is: if almost nothing of what is written in the bible is actually true, why should of all things something which isn’t written in the bible happen as a random fundie claims? The whole point of the apocalyptic jewish movements of the first century (including christianity) was the assumption that the end of the world is immanent. In the eyes of the first christians the “sacrifice” of Jesus served as a preparation for the last generation on earth to the end of the world. That’s why Jesus asks his followers to give away all their stuff - they didn’t expect to live much longer, didn’t see the necessity to bequeath something to their children.
And if you are an agnostic (which in itself is not very precise - agnosticism IS NOT the middleground between theism and atheism. I myself am an agnostic atheist when it is about the general idea of a god [maybe such a being exists, but I’m not convinced yet], but a gnostic atheist when it is about the god of the bible [I’m convinced the biblical god doesn’t exist because he would be an incoherent absurdity]) who isn’t sure whether a god exists or not, are you equally worried about the end time predictions of other religions? What if one of them is right? Why is it that you are biased in favour of the christian god? Maybe judaism or islam are right - and all who are worried about Jesus second coming are idolaters in the eyes of god.
Don’t get me wrong: I don’t want to mock you for your worries. I feel with you because although you are seemingly not fully convinced the culture around you exerts pressure - the belief in the christian deity is still deeply ingrained and although based on facts its existence is equally unlikely as any other deity our cultural environment makes people think it had somehow more validity than any other god of the long human history.
English isn’t my native language, that’s why I can’t express my thought as adequately as I would like to - but I promise you: the “prophecy” of the OP is bullshit.