First, you are probably fine. But there are things you should consider to improve your odds.
The primary issue is that the 4% rule is based on an 80/20 asset allocation. With so much of your funds in cash, you will not have sufficient return to pull the full 4% every year, so keep that in mind with planning -- you should assume more like a 3% draw. I get that you are risk-averse and cash-prone, but have you considered that your SS is basically a guaranteed US bond, and your pension is basically a corporate bond? In your situation, given how close you are to eligibility to claim that $$$, I would consider the "value" of those benefits as bonds in your portfolio and base your asset allocation on that. I.e., how much of your $$ would you need to have invested in government and corporate bonds to throw off the @$70K you are expecting from those sources? It will be a lot -- like on the order of $2M! So add that to your current portfolio as a bond allocation -- now how does the picture look? Turns out that in terms of portfolio risk, you have about, what, 12% in stocks, meaning that almost 90% of your portfolio is in assets that will not grow over time. Is that where you want to be?
The second issue is longevity. Right now you are fine. But you need to look at your scenarios for after one of you dies. At that point, one of the SS goes away. And what happens to the pension? There are all sorts of options, from no survivor benefits to 100% survivor benefits. But assuming that you've chosen the most common 50% survivor option, that means instead of over $70K/yr in guaranteed assets, the survivor is down to about $40K. And with your current asset allocation, your portfolio may well
not have grown enough to cover the difference. One way to counter this risk somewhat is to postpone your taking SS until 70 -- that way, whoever survives longest will at least have a higher SS payment to count on.
Finally, consider
@lhamo's note about taxes and SS timing. You have a varied enough asset pool that you will be able to manage your income each year in tax-favorable ways. For example, up until your DW takes SS, the only income you will realize is dividends/interest from your taxable investments and whatever you withdraw from your IRA. And you can currently pay 0% tax on income below $24K/yr (and the next $18K is only taxed at 10%); meanwhile, if you keep your income below around $78K, you will pay 0% tax on any capital gains you incur. So you can play with your withdrawal strategy to basically pay no tax for those first few years.
You can also shift your assets around to position your assets more favorably for future needs. In particular, you can convert some of your IRA to a Roth every year, and you will pay no taxes on that conversion as long as your total dividends/interest/conversion doesn't exceed $24K/yr -- so, perhaps, live off of your cash deposits (because taking cash out of a bank is not a taxable event), and use your "free"/low-rate tax space to convert as much as you can from your IRA to your Roth, so that when your income is higher (pension + 2 SS + RMDs), you can rely more on your Roth for extras to keep your tax burden as low as possible.
Finally, note that this strategy is highly dependent on when your DW claims SS, because once the SS begins coming in, that will eat up some of your "no income tax" space and therefore significantly reduce your ability to convert $$ from your IRA into your Roth.* If I were you, I would focus on maximizing that conversion over the first few years, and then claim her SS only once you have most or all of it converted. Note also that the more you convert, the lower your future RMDs, because Roths do not require RMDs, so that again gives you a better option to let your money grow completely tax-free so that the survivor will have enough s/he needs it.
*Note that the SS program is treated differently for tax purposes, but once your income exceeds @$25K/yr, you have to start paying income taxes on at least half of your SS.
