Extension packages not visible / available for postgres 12 yet ?

L.S.,

While trying to upgrade to postgres 12, it seems some xxtension packages not visible / available for postgres 12 yet ?

My sources list contains the apt.postgresql.org repo and I don't get any error while running apt update: 
    deb http://apt.postgresql.org/pub/repos/apt/ buster-pgdg main 12

For example i can't find with apt / aptitude:
    postgresql-12-pgrouting
    postgresql-12-postgis-2.x

Are these packages unavailable yet ?
If so do you have any idea when the will get available ?

--

Sander