How fucked am I?

I did all the preparations before the cold snap hit. I disconnected hoses, put the foam covers on, even opened up the cabinets on the other side and kept indoor faucets dripping. (Kitchen sink is on the opposite side of the wall.)

How fucked am I? Is it safe to assume my outdoor spigot has busted? At what point do I call a plumber if so?

Cold weather will last for several more days and even get worse, so it will not unfreeze for a while.