Answer

Yes, traditionally after doing upvas, the next day Parna is done after Navkarsi time.

This means you should not break the fast immediately after waking up. You wait until the proper Navkarsi time, which is generally after sunrise as followed in your local Jain tradition.

Explanation

In Jain practice:

• Upvas means fasting for the full day.
• Parna means properly breaking the fast the next day.
• Navkarsi is the time after sunrise when food or water may be taken according to the vow being followed.

So, after upvas, Parna should generally be done only after Navkarsi.

Takeaway

For exact timing, follow your local Jain calendar, temple announcement, or ask your guru/elder, because Navkarsi time depends on the local sunrise.