Here's the one I got: https://www.amazon.com/dp/B0924XXLWB?psc=1&ref=ppx_yo2_dt_b_product_details
There isn't a "window of opportunity" per se, they said it could be pretty effective no matter when you start. but it may help it come back even faster earlier on
Here is the one my husband's home health care nurse used.
Moxe has a solid kit on amazon. MOXĒ Smell Training Kit, 4 Essential Oils, Olfactory Regeneration, Helps Restore Sense of Smell, Natural Therapy for Smell Loss, Lemon, Rose, Clove, Eucalyptus, Guidebook, Personal Log https://www.amazon.ca/dp/B0924XXLWB/ref=cm_sw_r_cp_api_glt_i_1VR2SEDD7K544K8QP3ZP?_encoding=UTF8&psc=1
Too soon to say if it works, but I've been using a smell training kit. Food is super unappealing to me right now unless it's very sweet, salty, or sour
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My husband had cancer and his home health care nurse had had corona about 6 months earlier and lost her sense of smell/taste. She bought a kit like this oneand used it for 2 weeks and she was able to slowly start smelling things again. Read the reviews and see if this might help you. She was beside herself over not being able to smell anything - this worked for her. https://smile.amazon.com/Essential-Olfactory-Regeneration-Eucalyptus-Guidebook/dp/B0924XXLWB/ref=sr_1_fkmr1_1?crid=3HF5A56YPXMDV&keywords=covid+smell+training+kit&qid=1647251754&sprefix=covid+sm%2Caps%2C74&sr=8-1-fkmr1
Some people have forced themselves to eat trigger foods and then claimed that the "training" helped their recovery. Others have said that they avoided trigger foods like the plague and have recovered just the same. It's really unclear.
Doctors do recommend smell training though. You get a kit like this and smell the smells for 30 seconds each, twice daily, while thinking about how they're supposed to smell and trying to to remember the correct smell: https://www.amazon.com/Essential-Olfactory-Regeneration-Eucalyptus-Guidebook/dp/B0924XXLWB
The studies on smell training and olfactory recovery supposedly showed some evidence that it does help, but it wasn't definitive due to not having enough participants, or something like that.
I do the smell sticks daily though. They smell quite good for me, for some reason, and it's nice to just have something nice to smell.