i just did a data wipe while installing a new ROM...so it was perfect timing to take this screenshot for ya!

 

At this point I'd suggest waiting. The official jelly bean update is rumoured to be coming out in two weeks. There are already leaks of the official build, which indicates its nearing completion.

 

Well, when the JB update is released to the individual carriers, not forgetting that the NA carriers will probably be behind the International version, we can't say for certain that everyone will be updated within a few weeks.

However, to the point that the OP is asking, no, there is no way of installing google now without rooting until the official version of Jelly Bean is released to your phone.