We just got back from this which was fun (and it worked out so both girls could come):
https://www.mlb.com/news/jacks...ood-visit-petco-park
So far the adjustment is going well. He's very mature about the baseball part and still an 18 year old with everything else. Examples: 1. He asked us to buy him a pan for their residential hotel room (dude, you have your own money...go to Home Goods and drop $19 on a pan); 2. he met Blake Snell this weekend and talked to him for 20 minutes...75% of which was about whatever video game they both play; and 3. He "forgot" to tell us his hand x-rays came back clean for almost a day...but he did tell his sister who also didn't think it was worth mentioning. 
He's missed 5 games after taking two 95 mph fastballs (the one to the hand is the one that had him out). He came back for one game on Monday and aggravated it throwing someone out trying to leg a single into a double so he didn't play on Tuesday. So far, after 21 games, his BA is .318 with an OBPS of .825. He's playing all his innings at center which he loves. He wants to cut down on strike outs and increase multi-base hits but otherwise he's doing well. They have two more weeks and then they have a week off before fall instructs start.
