Daily is definitely too frequent. Visits OR phone calls. Too much. As you've noticed, there are no phrases right now. As long as he sees you every day - the topic in his brain is YOU and FREEDOM (lol).
Every move is stressful for them and possibly they progress....and he has to build relationships with the staff there for now AND so when he progresses, he'll have people there who know and understand him and can work with him. THEY have to keep him CALM. GREEN not RED. You're only there visiting and not really having it fall on you after you leave and he's charged up. Or he knows enough to anticipate you at night so he's fixated on it and "she's picking me up" (perhaps in his brain at least).
I hope I'm wrong but he COULD be the type who's gonna lay on that now all the time :"Going home" business. Remember when I said you may find him with his stuff "packed" one day? And you may have to lie that "We can't leave until.....whatever" Or that your car is broken.
So if he starts insulting you about it don't be hurt. Like: "Oh you think you're so smart all you want is my money" or other nonsense like that.
My client said to her daughter on the phone after an HOUR of drama that the daughter caused (because she was INSISTING she was going to "explain" to her mother why she couldn't leave)...: "Oh ok, missy just go powder your nose or whatever other mundane bulls$it you can think of instead of picking me up." hahahahaha Not to mention - half the country away.
When I called that daughter's sister and told her we were howling laughing but the one on the phone was totally frazzled about it. DON'T GET THAT WAY. He's got a demon in his brain.
When he's in a mood NOTHING YOU SAY will be okay because he's just going to change the subject or keep arguing even denying stuff he said in the last sentence. (eventually)
I'd call or go see the clinical director (a nurse probably?) and say you're backing off because you want to decrease his anxiety and give them an opportunity to create some routine...but please call you if something is going on they feel is too much. LIKE if he's anxious and getting hostile more or for longer periods. And that you'll continue to check in with them. (so they don't think you're abandoning him or something).
That's usually when the psychiatrists would consider an anti anxiety med in the morning and then as needed later on for the nursing staff if they see an eruption coming.
Speaking of which, psychiatrists want to see them to renew many drugs and it's difficult to get them out to do that in later stages. Catch 22. But SOMETIMES the general practitioner will prescribe it but IMO they should NOT - unless it's in partnership with the shrink.
He might go either way - calm down and accepting or escalating the anxiety which then can turn really bad. So unfortunately the only way you have to see if YOUR being there is a negative is to trial and error it.
Going out is a toss up. Sometimes fine, sometimes horrible.
P.S.The only "good" lie I can think of right now is that your house has mold and it's going to take months to repair so you're staying with a girlfriend. Someone else used that one here a couple years ago and it worked. Might even have been partially true, I forget.