If you opted out, you probably opted out of the whole TAG program. Someone in your institution knows the history, or you can review the three (yes, three) Excel spreadsheet lists of banks
HERE that have opted out of TAG for each of the opt-out windows to see if your bank appears in one of them.
If you're on one of those lists, you don't need to send any notice under §330.16(c)(2).
If you aren't on the list, you may have accounts covered by the TAG coverage that won't have coverage under the temporary 330.16 rules. If you have any IOLTA accounts, they'd need to get a notice, and if you have any NOW accounts with rates capped at 0.25% or lower, they'd get one, too.