Bulk Assign Tags

Hello everyone!

I am looking for a way to assign tags to records in bulk.
We have a booklet that we mail out to an address list of around 5000 and we want to tag the accounts that were included in the mailing.
I thought to add a tag with the name and date of the mailing but in the report view I can only bulk assign tags to the records that are currently in view.
Is there a way to assign tags to 5000 records at once?
Is there a better way to accomplish this goal of recording the data?

Thank you!