Yes, Hermes are still delivering parcels, and they're taking steps to ensure there’s no risk to you or their couriers. You can request delivery to a safe place on your property, so that your parcel is delivered with zero person-to-person contact. Please see the Hermes website for instructions on how to do this after your order’s been placed.
If you haven't already, downloading the Hermes app will make things even easier for you - under 'My Places', you can set up a safe place for both deliveries and returns, take a picture of it for the courier's benefit, and mark it as a GPS location.
Don't worry if you're not able to do this though: if the courier does need to ring the doorbell, they won't ask you to sign their device – they'll do this for you, and take a picture of the parcel as proof of delivery.