Give your real estate broker a call, and also contact your title/closing agent. Either of them may have already completed this task for you, especially if you are being charged a "conveyancing" fee.
I don't have the information for Lansdowne at my fingertips, however many townships throughout Pennsylvania have different procedures to follow in order to obtain an Occupancy Certification. Some may require certain inspections that would require appointments. I have seen Certs obtained in less than a day and some that take several weeks. If I were to make an experienced guess, you might need to wait about a week to obtain your cert. Given your Monday settlement date, I hope the township can rush this for you.
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Principal Title Agent
Liberty Bell Agency, Inc.
"Experience a Better Closing"