The economy can grow until we know everything about everything and all mass and energy in the universe is allocated to the being capable of reason that values it the highest and used for the highest possible value for said being.

What economics growth means is simply that we do more with less. Less resources and labour are needed to maintain the same standard of living when we have growth, this is quite beneficial to the environment and everyone in the economy. This ofcourse also frees resources and time that can be utilized elsewhere increasing the standard of living, but it is up to you if you wanna do that or not...