For bank accounts CRS only automatically reports interest earned and the balance on December 31. Incoming and outgoing amounts from your other accounts or from other people are not automatically reported.
That being said, the existence of the foreign bank account would now be known by the resident country's tax authorities.
I have never heard of it actually being done, but the tax authorities can look into the zero balance and are able to ask the foreign bank for statements.
Whether one wants to take that risk and empty the accounts before year end, it's up to them. If you're a tax resident of a country in North America or the EU, I personally wouldn't.