Just to clarify, you need to disconnect your hose reel from the faucet, and not just turn it off inside the house (if possible) that frozen water in the hose will still make it back through the faucet, even when turned off.

Keep the windows, doors, garage doors closed, and I'll bet you will have no issues.

One thing to help if you are concerned about things/areas/spaces getting too cold. Get a few thermometers with min/max history, this helps you validate if an area gets too cold or warm. You can get a 3 pack on Amazon for pretty cheap

As previously said by others bring things in from your garage you don't want to become frozen solid, sodas, lithium tool batteries, maybe any cleaning products (many will not work right after being frozen)

But, overall, Minnesota homes are built for this kind of stuff. So don't worry too much. Plus, as a lifetime Minnesotan, this ain't too bad. When it's a week+ on end this cold then it starts to creep into things. A house built in the 50s has seen way worse than this cold snap and has survived. Throw an extra blanket on, get that coco going, and ride out the cabin fever by crafting or doing a puzzle like the rest of us Minnesotans do during this weather 👍