Haven't been in France since corona day one but this is what I gather from the press: everything is open, including restaurants, hotels, camp sites and even cinemas, under social distancing restrictions. French social distancing is... 1m (unlike 1,5 in most European countries). You have to wear a mouth mask in public transport, museums etc but not in shops. Concrete measures may vary a little from region to region. All in all not much that can hold you back from having a great bicycle trip.