That’s definitely stressful, but your fish should be okay for a short while. In a 1700-gallon pond with lots of plants and only a dozen or so minnows plus fry, water quality usually holds up for a day or two without circulation. The plants will help keep ammonia and nitrates in check, so immediate danger isn’t likely.
That said, stagnant water can heat unevenly or develop low-oxygen spots, especially on warm days. A simple temporary fix is to manually agitate the water—scooping and pouring water back in with a clean bucket or using a small battery-powered aerator can help. Even intermittent circulation is better than nothing.
When you replace the pump, looking at Best Pond Pumps From EasyPro or other reliable models can prevent these headaches in the future. For now, monitor your fish, avoid overfeeding, and they should ride this out fine.