NON-O Married to Thai yearly extension lump sum banking method (please confirm steps) CW Immigration

As my date of lump sum deposit approached, please confirm the steps:

1. Deposit a little over 400k and update passbook on 21 December 2022. Should I get bank letter at this point or not?

2. Wait Seasoning, which will be 11 days in December, 31 day in January, 28 days in February, so I will have 70 calendar days in

total before application

3. Apply for extension on 1 March 2023 with usual set of documents, updated passbook and bank letter.

4. On the day of appointment to get final stamp, update passbook again (deposit any small amount to reflect funds still on account)

Thanks.