Unless they gave you a paper of notification, you count 90 days from your last entry date. That's your next 90-day report due.
You submit a 90-day report to the office that serves your latest valid TM.30 address. When you move, submit TM.30 to the Chonburi immigration office, then it's the office where you do your 90-day report. Make sure Chonburi don't do TM.28 to move properly.
If you mean you already applied for a 1-year extension and you are on the under-consideration period now, then go to the Chaengwattana office to get the stamp for the rest of the 1-year extension, you don't need anything other than your passport. But bringing the updated bank passbook is not a bad idea.
If you mean you are applying for a one-year extension, you need a bank letter and a transaction report up to 7 days old. You don't have to get new ones if it's issued within 7 days. You also need an updated bank passbook, original.
You put a small amount of money into your account and then update the bank passbook on the day you go to the CW office so that the officer can see your funds are in your Thai Bank account on that day.
, Are you sure you are applying for Non-O, not Non-OA? Medical certificate and insurance are the requirements for Non-OA, Non-OX, and LTR-P, not for Non-O being over 50 yo.
Bring both old and new passports to enter Thailand. Show a valid Non-O visa/extension with a re-entry permit on the old passport at passport control, and make sure to get the correct entry stamp matching as re-entry permit, on the same date as the valid stamp.
If he is already on a one-year extension, he needs to transfer stamps.
Once back in Thailand, go to the immigration that issued the current extension to apply for transfer stamps. Basically, he brings both old and new passports and updated TM30 to transfer stamps. There is a form, "TRANSFER STAMP TO NEW PASSPORT FORM", to transfer stamps at the local immigration office. But you need to check the detailed requirements at that immigration office.
You must enter on or before 16 February 2025 if you want to enter/stay based on that valid METV. You will be stamped on visa-exempt entry after that date, as a French passport holder.
You can apply for a 30-day tourism extension to the current stamp on or before 13 March.
, That depends on the office. Also, they do case-by-case. Some offices do home visits. Some offices do interviews on video calls. Some offices ask for witnesses on those occasions or ask you to take witnesses to the immigration office.
You need to ask your local IO and follow their direction about that.