Inheriting euros, should I change it in CHF?

[Tmask]

Hello dear Mustachians,

I’m lucky enough to have my parents donating me around 500K € from their savings.
What should I do with 500K€ in my bank account?
The idea is to use them as a down payment to buy a house here in CH in the next 2 or 3 years
What worries me is the FX rate, what is the best approach.
Should I change smaller amounts every month?

Thanks

T