If we are being absolutely honest, no, making your MVP comply with all of the accessibility guidelines before going live is not worth the effort. Given that
most sites/projects/startups end up shutting down early-on, the odds that your project will end up being used by anyone with significant impairments is very low from the start. I believe medium to large size businesses should absolutely accommodate for accessibility, but the burden is really high and the benefit is really low for smaller services.
All this being said, the cottage industry of lawyers going around suing people for ADA violations is significant and something to be aware of. What I would suggest is that you do the bare minimum of accessibility accommodation, based on your jurisdiction, and only look into adding more accommodations as you grow and scale.
Edit: It makes sense to give alt text for images, use good contrast, and to follow best practices for UI/UX. See what the major complaint(s) are against your friend and try to avoid that for the time being. In essence, don't feel compelled to pay a consultant thousands of dollars for an amount of accessibility that is overkill at this stage.
Lastly, what I wrote sounded harsh, and I really do wish you the best. I would hate to have you spend thousands on premature accessibility and potentially lose the ability to fund something else that might help your project. Best of luck.