The sum total of the wealth of all the billionaires in the US in 2021 was ~$4.1 Trillion [0]. That's about the same as the government budget in a normal year pre-pandemic, or about 2/3 of the government budget post-pandemic.
Assuming a $1000/month and a population of ~350 million, you're looking at $4.2 Trillion per year. You could almost fund it for the first year by taxing all of the wealth of the billionaires at 100%.
But what are you going to do the second year? That's total wealth, not yearly income.
[0] https://www.forbes.com/sites/tommybeer/2021/01/26/report-ame...