What is the notice period and documents required for OCI marriage?

I am 43 years old, a Hindu, and a divorcee. I am originally from Kolkata and have been based in Pune for the last 10 years due to my job. I am planning to get married for the second time. My fiancée is an Overseas Citizen of India (OCI) from Manchester, UK, and is also a divorcee. We want to marry on 30.06.2024. I plan to relocate to the UK post-marriage on a Spouse visa. Our questions are: What is the notice period for marriage registration if one person is an Overseas Citizen of India (OCI)? What documents are required in our case? How long does it take to get the marriage certificate? Is there any fast-track service available for marriage registration? Can we fill out the form online on the Pune marriage registration website and upload soft copies of the documents? Since it's difficult for my fiancée to come to India before our marriage date on 30.06.2024, can we complete the registration formalities online?