Won't hurt your yield at all but you could have rolled the main stem hard between your thumb and fingers to soften it up then just flopped the top over. The top cola seems to get even bigger doing that than topping.
Once you remove the top the energy that would have gone to it gets spread out to all the buds growing on the upper colas of side branches so they end up a little bigger than they would have if the top was still on. You'll end up with the same or better yield but just won't have that big main cola to show off but most of us top too so don't get those either.
Preferable to top earlier but no real harm done.