Incorrect. The difference between interstellar travel and land based travel on earth is enormous. The difference between current AI and AGI is tiny in comparison.
You're not saying it, but people might interpret 'interstellar travel' to be faster than light or very close to it, which means breaking the laws of physics or spending prohibitive amounts of energy. AGI needs no such thing, as evidenced by human brains running on < 100 watt.
Interstellar travel at far lower speeds is indeed probably something we will be able to do, looking at what we've done in space travel in the past 100 years. Although again, the resources required to do so as dictated by the laws of physics make it incredibly expensive. Given the low benefit it is probably not going to happen soon.
Reaching AGI is cheap as fuck and far more potent in comparison, so it will happen sooner.