The first sermon preached by John Chrysostom as a priest in 386 AD is extant (PG 48, 693-700). A German translation exists in the old Bibliothek der Kirchenvaters 3 (1879), p.401-414. It is also one of the texts translated by Bareille’s 11 volume French translation, and appears in volume 1.
As far as I know, no English translation exists. I don’t know that the contents are particularly noteworthy. But I fancy translating something, so I may run Bareille’s French across into English. It won’t be publishable, but — who knows — it may make the text more widely known.