My guess is that we would be more of a gig economy, working when we need to and doing jobs that are individual and timely that benefit from the human touch.
If I were emperor of the earth and could dictate what work would be like in the year 2140, dumb AI (that is still a few orders of magnitude smarter than our current best AI) would handle all of the rote tasks, assembling devices, farming, mining, things like that, smarter AI would handle corporate paperwork and accounting, managing cleanup and repair of any remaining ecological harm we have caused in the last 400 years or so, mining asteroids for valuable materials, etc., and in the mix of this humans would use AI systems to design and develop new products, take on new endeavors, provide medical care and create social events to fill in the massive time gap left by the actualization of our prosperity.
A typical work week would be roughly 20 hours, comprised of either 5 4 hour shifts or 2-3 8-10 hour shifts depending on the industry and the need. Your basic needs, food, clothing, education, and shelter would be given to you for no cost as long as you participate in the system, and the rewards for working would be being granted access to higher echelon products and services, and you could voluntarily retire after roughly 20 years of employment or less if your career is particularly difficult or straining on the body.
Your echelons would be split into at least 4 tiers, base tier, bronze, silver, gold. You can work up tiers by either working more, or by merit should you provide or create something that is immensely useful or wonderful, such as art, or a movie, or an invention that gets used around the world.
Even then, there will be plenty of work to do and the salary you receive for your work would be equal to the skill and talent that you possess and what merits your contributions to the cause bring, and this would be negotiated for you as fairly and equally as possible by systems whose job it is to make sure that everyone gets a fair share.
Sure, this is all my imagination and would require a dramatic shift to some sort of AI enforced utopian communism, and it also relies entirely on people being willing to participate in such a system, but once again, if I were emperor of the earth that is what I would aim for.
So yeah, there would still be salaries because I expect remuneration in exchange for my work for others, and I assume most other people do, too.