Now is flexible in its placement. It's not wrong to put it in between is and my.
It is my turn now!
It is now my turn!
Now it is my turn!
These are all correct and I believe they are all accepted. Adverbs can usually move around the sentence with very little or no change in meaning.
Yes, all of them :)
Did you report it?
How about: my turn is now.
Well, I guess that's "Moja kolej jest teraz". But okay, let's add it anyway.