I expect the Harvester to be about the same price as the full EV version, if not even slightly cheaper, because the cost of adding the gas engine should be offset by using a much smaller battery. Big batteries are expensive, and also the harvester version will use an LFP battery which are cheaper.
I think the Q3 2024 debut is not realistic, unless by "debut" we mean pictures of pre-production models that will probably be nothing like the production version.
The CEO says they will begin production at the end of 2026, and first retail sales to begin soon thereafter according to this...