So for the first time since June, I'll be alone in the house all day. It will be weird, but I'm certainly not worried about anything. If that goes well he'll go in a few more days in the next few weeks until I'm ready to drive again. It feels like a great milestone.
It is indeed a great milestone! And it is definitely do-able.
My sweetie has been working every Friday and Saturday nights, and sometimes on Sundays, about 10 miles away this whole time. Luckily my TKR was on a Tuesday.
During the early weeks, and even to some extent now, he comes by before leaving for work, fills my ice machine, and checks to see if I need anything else. Then when he is at work, he texts me, asking if I am OK, and I text him back saying yes, I'm fine.
That way he doesn't have to worry about me as much and can focus on work. Also it makes me feel less alone. I know that if anything happened, like if I fell, I could call or text him for help. (When he is at work, I take my cell phone and glasses with me every time I get up to walk to the bathroom or anything else. ) So far I have not had to initiate a text to him at work, but I could.
At this stage (six and a half weeks), I don't really need this but early on, like you are, I found it to be very reassuring for both of us. Even last night, he texted me about what a beautiful evening it was outside and suggested I should go sit out there and enjoy it. I texted him back that I"d think about it. LOL I didn't go outside, but it was nice to get a text from him.
If this sort of thing would work for your Beloved and you, it is a great advantage to living in the digital age.
As for stamina and tiredness, my theory is that the more tired you are, the more your knees have been healing. I am farther along than your Newbie, though not as far along as your July. I have most of my energy back except on days when I over-do and get a set-back. I sit when I cook (on a high bar stool) and only cook simple things. But then that was how I cooked before TKR too. By now I have plenty of stamina to do the laundry and put it away although it wasn't always so. I also clean the counters and put things where they belong, and have plenty of energy for that, but don't do the floors or dust yet, or take the trash out to the curb. He drives me around on daily outings (lunch at a restaurant, driving around, doing drive through errands) now that I am up to it. If I go for a walk I rest and ice and nap for a couple of hours afterwards. On low energy days after over-doing, resting and napping is about all I do.