I don't believe there are any aircraft left on the airfield. But of course, there are two Museum sites. RAF Manston History Museum based in The old MT yard. And nearby the Spitfire and Hurricane Memorial Museum opposite the former RAF SHQ. Unfortunately, I think still temporarily closed due to Covid19? The only other aircraft were on the Fire Training Ground. Not sure you can gain access as an Army unit is now based there I think.
I'm still hoping that the airfield can re-open in some form. But, I'm biased as I was based there 1979 - 1982.