In the SASB metrics that ask for "Total amount of monetary losses …," should I disclose the amount that may not have been recognised in the financial statements yet (e.g., when a legal decision is pending and the outcome is uncertain)?

No. The scope of monetary losses included in the disclosure shall include only the losses that were accrued (i.e., on the statement of profit or loss) during the reporting period, which might differ from the amount paid in that period. The entity shall report the net amount of any loss or gain, including amounts reported in a prior period that are reversed during the current reporting period.

Although reporting companies may face different thresholds for recognition (i.e., “probable”) depending on whether they are reporting under local GAAP or IFRS Accounting Standards, SASB Standards Application Guidance recommends that, when providing disclosure in accordance with SASB Standards, companies do so in a way that is consistent with their financial reporting.

All losses accrued during the current reporting period shall be included in the scope of disclosure.