The Ten of Cups mean the experience of deep contentment, of having arrived. They can mean that we have completed an important stage of our development. We feel deep contentment, happiness and harmony - nothing is wanting.
The only tiny warning of this card is for me that, yes, for a while we can bathe in this feeling of having arrived and being contented. But it is very likely to pass again. New challenges wait for us. We have completed an important stage of our development; sooner or later it will be time to begin to tackle the next one.