Those plugs look great. Check your engine air filter if you’re getting bad mpg, otherwise take it to a shop for a diagnostic

I would change the oil as soon as possible. If your shops and dealerships are packed with appointments, simply do it yourself. You just need a container to catch the oil, 1 wrench that fits your plug, a new filter which is less than 15 bucks, and enough oil that the disptick reads a normal level. 1 trip to the store, maybe 50 for oil, filter and a cheap wrench and 5 minutes under the car and you’re done. Sorry if I sound patronizing, but premature engine wear isn’t worth the convenience of simply putting it off for another day