Short and clear answer:

1. Is Depayan Muni a Tirthankar in the next Chovisi?

- In Jain scriptures, the future Tirthankars of the next Utsarpini / next Chovisi are described, and their traditional names are given (like Padmanābh, Suradev, Suparshva, etc.). - The name “Depayan Muni” does not appear in these authentic lists as a future Tirthankar. - So, according to Jain Dharma as preserved in the granths, we do not count Depayan Muni as a Tirthankar of the next Chovisi.

1. Where is he now?

- Jain scriptures normally mention the present location only of Tirthankars (like Shri Simandhar Swami in Mahavideh Kshetra) or some very special souls whose future birth is clearly told by Bhagwan. - For other monks or persons, including “Depayan Muni”, there is no authoritative Agam/granth statement about their exact present gati or loka. - So honestly, within pure Jain view, we cannot say where he is now. His present state would depend on his own karmas, but it is not specified for us.

If you want to understand who the next Tirthankars are in Jain cosmology and how Jain time‑cycle works, you can read more here