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When I look it up in Timatic, the following comes up:
- Residents of Italy with an expired Residence Permit are permitted to re-enter Italy. They must also have a receipt issued by the Italian Post Office or Police Department proving that they have applied for the new residence permit in less than 60 days after the expiration date. They must return to Italy directly from outside the Schengen area.
This means you are OK with the receipt, as it was before 60-days after the expiry of your residence permit.
Keep in mind the second requirement also: Your flight must go directly to Italy as the first Schengen member state on the itinerary. You cannot pass through another Schengen state on the way to Italy when using the receipt to travel.