Hmm, should we be concerned?

Last night during the weather report ABC weatherman Mark Carmody said that once the minimum temperatures get to 13oC and above, tomato plants will start to thrive.  Our tomato plants are already very bushy, 1 metre tall and all have flowers and some have tomatoes growing. 

So my question is - have ours already thrived, or are they going to become tomato godzillas over the next couple of months???