The stove outlets are 3 prong, yes, but the outlet in the wall, next to the toaster, is 2 prong 20 amp. It looks like it's original from the 1950s as does that style of laminate counter.
In the 70s, we had relatives that bought a new 1977 portable kenmore dishwasher for their quaint cape cod styled farmhouse. There were only two 2-prong wall outlets at the kitchen counters but they had a white 30" electric stove with panel plugs. Even though the stove was about 5' from the sink, they would position the dishwasher between the two and stretch the cord so it would plug into the 3-prong outlet on the stove.