According to Jain Dharma:

• In our present time (5th ārā of this Avasarpinī in Bhārat Kṣetra), no new Kevalin (Kevalī / Kevalajñānī) will appear.
• JambūsVāmī (Jambuswami), the last direct disciple of Bhagwān Mahāvīr, is accepted as the last Kevalin of this time-cycle. After him, no one attains Keval‑jñān in this Avasarpinī. ( jainknowledge.com)

So, if you are asking:

• “When will the next Kevalin come here (Bhārat Kṣetra, present era)?”

Jain scriptures say: Now, in this remaining 5th ārā, no Kevalin and no Tirthankar will arise.

• Where can Kevalins exist right now?

At present, Kevalins and Tirthankars are only in Mahāvideh Kṣetra, where the time‑era is spiritually suitable and mokṣa is possible even now. ( jainknowledge.com)

In future very distant eras (next Utsarpinī etc.), new Tirthankars and Kevalins will again appear as per the fixed time‑cycle, but their exact dates are not given in our years; they are described only in terms of cosmic time‑eras.