News to Me! Delta Voucher Expirations

Many of you may know this, but since this debacle began I have been out of the loop. Sensing an end in sight, I called Delta to see when my unused vouchers for trips that were supposed to happen last year would expire. I assumed it would be by the end of this year. I found out that they do not expire until 12/31/2022. That is news to me. Now, I need to figure out the rules for canceling points flights across all airlines. And maybe, just maybe, I may book something one day.