Yes, it is indeed possible that there are stars in the universe whose light has not reached us yet. The universe is vast, and the speed of light is finite, so it takes time for light to travel from distant objects to our location.
When we look at objects in space, we are essentially observing them as they were in the past. For example, if a star is located 10 billion light-years away, the light we receive from it has traveled for 10 billion years to reach us. Consequently, we see the star as it appeared 10 billion years ago, not as it is in the present.
There are regions of the universe that are so far away that their light hasn't had enough time to reach us since the Big Bang, given the current age of the universe (approximately 13.8 billion years). These regions lie beyond what is called our "observable universe." As our observational capabilities improve and we develop more advanced telescopes and technologies, we may be able to detect light from currently unobserved stars and galaxies in the future.
Therefore, it is certainly possible that there are undiscovered stars out there whose light hasn't reached us yet. However, it's important to note that the expansion of the universe causes the light from objects beyond a certain distance to be redshifted to such an extent that it becomes very difficult to detect. This is because the expansion stretches the wavelength of light, shifting it towards longer, redder wavelengths. As a result, extremely distant objects may be extremely faint and challenging to observe, even with advanced technology.