Which part? The $60k/yr & $1.5M? or the “largely be tax free” part?
This is useful.
https://www.youtube.com/watch?v=11cY23h7ZY4&list=WL&index=204
https://www.youtube.com/watch?v=iP4DV4ZFYaM
https://www.thrivent.com/insights/taxes/taxes-in-retirement-a-comprehensive-guide
A lot can depend on tax planning before and during retirement.
The “largely be tax free” part.
ROTH IRAs are wonderful unless you make too much money to qualify, in which case traditional IRA and 401K accounts are the predominate source of retirement income. The withdrawals (principle + investment returns) are taxed as ordinary income. Although traditional IRAs and 401ks can be converted to ROTH IRAs, the conversion is a taxable event. Life insurance and annuities may be tax free in some instances (no taxes on the money going in or out), the costs are high and and the returns are low compared to other investments, and the big payout is the death benefit when you are no longer alive to enjoy retirement.