Yes. You can keep your holographic will at home. But by doing so, you take the risk that it will not be discovered when you die or that one of your relatives will make it disappear.
As a precaution, you can give it to a notary and ask them to register it in the Central File of Dispositions of Last Wills (FCDDV).
Therefore, whoever is the notary in charge of your estate, they will be able to find the name of the colleague who has custody of it.