I don't know about how soon, but June 20th is very recent to have your energy back following any major surgery.
I had translab June 13th and do very well after anesthesia in general (based on prior unrelated surgeries); this time, I needed a second op the next day to fix a complication from the abdominal fat transplant which lasted about 3 hours - still no nausea and quick to be lucid enough to be asking for food and drinks within an hour of being back to ICU.... I found that I had several days of feeling winded/a little short of breath just going up a flight or two of stairs. That has completely passed and I feel it was the toxic stuff needing to get out of my body. Currently, I need several naps a day, and if I let someone drive me somewhere, I'll be asleep within a few minutes whereas normally I would be chatting and knitting or navigating. I can do stuff, but it takes me much longer - yesterday I decided to clean out my fridge and it took me all day vs a couple hours but I deliberately took my time since I've been advised to avoid heavy lifting for 6 weeks post op to avoid CSF leaks etc.
Folks are in too much hurry to get better "get well soon!" vs aiming for a full recovery - if you feel a little better or stronger most days, (expect the odd day to be more uncomfortable or tiring here and there) then you are doing well. The rate of recovery will vary from person to person, but it for me it would be mostly 2 or 3 good days for each rough day for a couple weeks, then mostly only the odd rough night thereafter (healing happens when you try to sleep, and healing is not sensation-free!). I have no idea what it should be like for brain surgery as I've only had bone & joint procedures in the past but that's my idea of "normal" following surgery.
I hope you're on the path to recovery and will be able to give yourself time to allow your body to heal.