I’m almost 3 months out from having Covid (presumably delta). I lost my sense of smell completely a few days in. My sense of taste was affected, but I never lost it completely. I could taste all the basic tastes, but, e.g., I needed more sweetener in my coffee to be able to taste it. I could not taste most spices, I think because those are very smell dependent.
I did taste a piece of raw onion at one point, and it only tasted sweet to me.
My sense of smell was absolutely zero for a couple of weeks. Now, it is maybe 30% back. I just noticed today that my coffee tastes too sweet, so maybe my sense of taste is returning to normal now.