The technology to terraform mars is not available now. That won’t be possible until energy & water costs are 1/10th—or less— of current cheapest energy and (desalinized)water costs. That’s still maybe 50 years off. Nor is it cost effective to grow fruits and vegetables cost effectively in the desert except in green houses and vertical farms...-— today. However, 10 years from now technological changes will drop the cost of electricity by 1/2—which will then make desert farming cost effective.
The point is that it does not matter when any tech is ready or possible if there is no political will. There is none now and until that changes in a big way it will never actually happen. And the new tech to do that will not come from the US until we have a decent educational system again ... and again, there is no political will for that either.
Don’t get me wrong I’ve been looking for some thing to happen for the past 60 years. Until there is a drastic change, the US, for one, will be contemplating its collective navel and the Kardasians ...