Yes if your plant is doing fine now, I wouldn't transplant it.
However, we have bought fruiting plants from nurseries and transplanted them into the soil and into pots. If you do plan on moving your tomatoe give it good fertililzer I use kelp meal, nice rotted manure, liquid seaweed and liquid fish fertilizer. And be sure to keep your plant happy water wise, don't over water and don't underwater. It'll be stressed for a little bit, but I've found that they come back if looked after.