I have a question regaring a stress simulation (which iI am not that much into)
Does the results of the simulation on the image below tell me, that the maximum stress on the part is 693.4 MPa?
Thanks in advance
Yes and the area highlighted in red on the part tells where it is located.
Those corners look very sharp, though not an internal sharp edge (which is much worse) I would consider putting a small fillet across the top sharp edges and make sure your mesh is fine enough.
You have the top face constrained in all three directions, this could be causing artifical high stresses. You have to load and constrain your model to simulate real world operating conditions to get accurate results.
If you are doing stress analysis, you really should take a training class.
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