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You can get the ISBN but how much will it take, can't be decided since you need it at earliest. Actually it can't be done anything to speedup the process for getting ISBN being an applicant. If you wish to know the status of your application, kindly contact at below address.
Raja Rammohun Roy National Agency for ISBN
Room No. 13,4
th Floor, Jeevandeep Building,Parliament Street,
New Delhi 110001, Phone No. 011-23369668
I would like to remind you that the Raja Rammohun Roy National Agency for ISBN follow the principle of first come first served basis. As you can see herewith,
"After receipt of properly filled Application form with the supporting documents, allotment of ISBN is processed on first come first served basis".- Source: ISBN Application form
Hence, advised to wait.
I request to all library professional that you can contact DEO LIBRARY SOLUTION, NEW DELHI (J Krishna - 9717787850) for each and every services of library. This is a group of library professionals.
You can get ISBN no within few days. Write mail to email@example.com or visit us at https://www.pen2print.org/2019/08/how-to-get-isbn-no-for-books-and....