I am missing these folders off the iMac OS photos app.
On a Mac, the Recently Deleted album will only be shown, if you have recently deleted items. It will be hidden, if it is empty. And if you are using the very first version of Photos - Photos 1.0 on MacOS 10.10.3 Mojave, you have to reveal the Recently Deleted album with "File > Recently Deleted".
There may be several reasons, why your recently Deleted album is empty. Either you did not really delete photos, but you just removed photos from an album. Or the Recently Deleted album has automatically been emptied, because the 30 days are up.
And Photos will delete photos terminally, without moving them to recently Deleted, if you are running out of cloud storage. If we are using too much cloud storage, we have to be very careful when deleting photos., because there will be no way to recover deleted photos.