Hi Maria,
from your simulation you should get either a list of .vtu files for the timesteps with a .pvd file which wraps everything together. So just pick the file which is of interest to you and postprocess it to your liking. If you don’t want to use paraview then you can use pyvista to open and process it. Alternatively I would recommend you to try out our python package ogstools. Here are some examples which might help you get started: https://ogs.ogs.xyz/tools/ogstools/auto_examples/howto_meshplotlib/index.html
If your simulation produces an.xdmf file I would also recommend ogstools, as the MeshSeries calss makes it easy to access specific timesteps from it.
Hope this help,
Best regards,
Florian