And yet here we are

Surprise at a current situation
"And yet here we are" is a perfectly correct and usable phrase in written English. It is usually used to express surprise at a current situation, often in comparison to a prior expectation.

1. For example, imagine a team working on a project with a tight deadline. Initially, they weren’t sure they’d finish on time, but now, only one week away from completion, they can say, “We weren’t sure we’d be able to finish the project in time, yet here we are!”

The phrase "and yet here we are" is correct and usable in written English.
It is usually used to express surprise, disappointment or resignation in the face of a situation. For example: After all our hard work, I was hoping we would have achieved more success by now; and yet here we are, with only incremental improvements.

And yet here we are, discussing the period that she describes as "awful" and "extremely difficult".

And yet, here we are again.