I have been very busy cleaning house and getting things done

Cats are meowing again for food thats all that they have be doing since i come back

I hope you get your tickets sorted out for Londyn

So what have you been up to then today

Chodzi mi oczywiscie o pogrubione zwroty, rozumiem ogólny sens ale nie dosłownie

getting things done - uporządkować sprawy

thats all that they have be doing - to wszystko co robili?

get sorted out - rozwiązałeś problem

been up to - co porabiasz

Jak dla mnie, to zdanie jest niepoprawne:
that's
have been doing

If I might add, I would say " the cats and "since I came back and also cleaning the house sounds better than cleaning house