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I have one of these: https://www.toolstation.com/dewalt-dcs391n-xj-18v-xr-165mm-cordless-circular-saw/ which says it can do 55mm but I'd be surprised if I can make a tidy job of it.
I wouldn't trust my bosch 18v with worktop material, the dewalt is likely better and it will depend on the blade sharpness etc. Borrowing a track/plunge saw would be my go to. Or any other corded saw and use a straight edge as a fence
This was my original plan (though it involved buying smaller/cheaper pieces of 'something' and assembling rather than spending a chunk plus delivery on this). Seems a shame to cut it if there's a way of avoiding. It's going to be a desk (just so I can lord it over @Soul ) that I'm going to be looking at a lot in the coming months so would be nice not to be irked every time I stood over it.
I have one of these: https://www.toolstation.com/dewalt-dcs391n-xj-18v-xr-165mm-cordless-circular-saw/ which says it can do 55mm but I'd be surprised if I can make a tidy job of it.