Expected response date for submitted CF83 form. - Enough time?

I live overseas and plan to catch up with my NI contributions going back to 2006, I have completed CF83 and supporting documentation (employment records). This was posted by mail (recorded delivery) and documented as being received by the future pensions team on 11-Mar-2024 Reviewing my file online, I see that it has been received, but that the expected response date is 10-March-2025 ! My concern is that if the HMRC response is posted overseas, and if any clarifications or additional supporting documentation is required, then it may well push me past the 5-April 2025 deadline. Is that deadline a hard stop for payment to be made? Or will applications continue to be processed if received prior to that date? I'm a year early here, but still very concerned about missing the deadline. I'd appreciate any advice on this Thankyou Jonathan.

Bump - In the hope that a HMRC moderator will respond. Thankyou!

Hi Jonathan Gregory,
The applications to pay voluntary national insurance overseas will have a time to pay date on the letter when it is issued.
That means the date may go over the 05 April 2025 cut off for overseas cases like the scenario you have advised to let you pay past the deadline.
Thank you.