If you won't see frost until June, you have plenty of leeway. If you want more veg growth, you can keep the veg nutes for a while until you're at the size you want.
But a two week transition is good. Plants like N the first couple of weeks of flower, it seems.
I've seen some flower nutes have little or no N in them. I would definitely do a transition if that's the case. Otherwise, you can just switch. If you see yellow leaves at the bottom, you can add some veg nutes to the mix next time.