You won’t get a courtesy car before your own has arrived.
Best you contact the garage for info on when yours will arrive but even getting that 100% confirmed is unlikely. Otherwise start phoning around for something available for immediate delivery, and even then it’ll still take 4 or 5 days to get the paperwork done so don’t waste any time if you’re desperate for a car… you might not get the car of your dreams but it’ll keep you mobile 🤞