The production should start before October, in july RPL published that 94% has been completed and only commissioning is pending that means for commissioning it takes only 30 - 45 days. According to this 3rd week of September they will start production
See below the publication
Investors never think twice before betting their money on Mukesh Ambani. Now that crude oil prices are touching record highs, his yet-to-be-operational, Reliance Petroleum has set Dalal Street on fire and left traditional Public Sector Undertaking (PSU) refiners far behind. Reliance Petroleum now has a market cap of Rs 1.17 lakh crore with a capacity of only 29 million tones. The figure is quite high in comparison to the combined market cap of IOC, BPCL, HPCL, MRPL, Essar Oil, Chennai Petroleum and Bongaigaon Refinery and their total capacity.

More interestingly, while Reliance Petroleum's revenues and profits will kick in only by the second half of next year, the existing refineries are sitting pretty wi ...more

Ask this question to the Ambanis maybe they might have an answer

Once the production starts before end of the year the outcome is 5.8 lac barrels per day.

i am trying to do a simple maths here.
if profit is $15 per barrel.then580000 bpd =8700000$ per day.
which is 3175500000$ per anum
which is 13337.10 INR crore per anum (@42)
total shares of RPL = 450, CRORE
earning per share =29.63 INR
at P.E =10
RPL should trade at RS.300 - Rs.450 - as per the estimate MAR 2009 -

I don't think they know either