What should I do if my 90-day visa report is still pending before the due date in Thailand?

You won't be overstaying if you're still allowed to stay. You also have another 7 days after 25 Oct to report. You may wait for another 1-2 days for the approval

First, 90 days report is not an extension, your lack of 90 days report does not mean you are on overstaying. But if you submit a 90-day-report late, you may be fined 2000thb.

Currently, the system information says it'd take up to 3 WORKING days. See what result you will get tomorrow.

Even if your application is not approved tomorrow, as your 90 days due is 25th, you can check the reason for declined, try online reporting once more within 25th. If still not approved, then go to the local immigration office to submit in person within 31st Oct. Or just go to IO.

90days reporting windows are:

- At the local immigration office: 15 days before until 7 days after the due date

- Online: 15 days before and until the due date

- By legacy mail (EMS from Thailand Post): post stamped at least 15 days before the due date

You have one more week to do it in person without a fine for a delayed report.