Hi Vincent, Welcome to Healing Well forum. We are glad to have you.
I personally don't have any experience with PVC's, I have a pacemaker for bradycardia and sick sinus syndrome so I have slow heart rate. However, I can sympathize with your being scared of what could happen. The Toprol should help with this, but you can always call your pharmacist and ask them how long it would take for the medication to reach it therapeutic level. I have no idea, and couldnt find it on-line for you (sorry!) hopefully someone else will be able to answer this better than I.
I like Everybody Loves Raymond too. I always have to watch it, that's funny.