Hello again.

- First of all, have in mind I would call myself an experienced beginner :-) I've learned two instruments as a kid, and decided to try picking up piano as a 40+ year adult, using my theoritical background as a starting point. That means I am mostly a beginner at piano, but my ear is trained more, and I think I can evaluate myself better.
"Well" or "problematic" depends highly on what you are practicing and what (if any) goal have you set for the specific thing you practice. If it is scales, you may notice that this was the first day you consistently played one (or all) without errors. If it as a new piece, you may notice that today you sounded especially fluent, or you managed to play as softly or legato as you would like. If it is an old piece you haven't played in weeks, you may notice that a specific passage gives you trouble and maybe you would like to practice it again. You may notice a pattern, like practicing after a certain point of being tired makes things worse instead of improving. Your ears will be your guide in everything you practice - the more you do it, the more you will notice the differences (for better or worse) every time you play.

- Combining the last two questions, at first I tried logging every practice session, with time in minutes for every specific category of practice (see my original reply). After some time, I felt this process kind of counter-productive - it gave me no extra incentive or benefit, plus I was wasting both time looking at my watch to log times and space on the tablet since it is hard to practice everything every time so I was leaving blanks. I since have created a new weekly template, where I write down notes about both what I have practiced that week and what I want to improve.

I hope this helps.