I don’t think a transhumanist has to say that time itself will end in utopia. Relative social progress might still be possible if later stages were better than previous ones, according to subjective standards of what we want. So if people want to be powerful, and technology is empowering, technological advances would be progressive.
Thus there might be a point in the future when technology will turn us effectively into gods or into a Type III civilization on the Kardashev scale. That species might ultimately perish in the distant future, but it would presumably have unimaginable advantages, such as a very long lifespan for its members.