Translation: We are doing
What are you doing now: ¿Qué estás haciendo ahora
Nosotros estamos = "we are"
'Y que haciendo' is ungrammatical, but means: 'And doing what'
It means "We"
You answer: "Estamos en (name of the month)"
"Lo que está haciendo" means "what he/she/it is doing" in Spanish.
en que mes estamos means en que mes estamos in Spanish. However if you were wondering what it means in English it directly translates to "in which month we are"
Doing that means
Here we are. We are here. It means both.
It means "if you are doing" or "if you are making".
we are here. More generally, it is from estar, "to be", in the third person singular. It is commonly used for speaking of position, so with no other information, it could mean we are here. More commonly that would be estamos aqui.
It means, "We are in the winter."