How to care for Early Girl tomatoes in winter even when plant has tomatoes on it not quite ripe yet?
Tomatoes are warm weather fruits, so when the weather starts to get cold, that will be the end of the tomatoes. You can pick unripe tomatoes and bring them in for ripening: https://www.gardeningknowhow.com/edible/vegetables/tomato/how-to-turn-green-tomatoes-red-how-to-store-tomatoes-in-the-fall.htm
You might like to try growing tomatoes indoors, for some fresh fruit all year. This article has some ideas: https://www.gardeningknowhow.com/edible/vegetables/tomato/growing-indoor-tomatoes.htm