All looks OK to me.
Yeah, you can't expect to notice much difference between drives when you're not really demanding much of the disk. But it can show up on stuff like virus scans, large file copies/moves/backups, loading 20,000 files into a jpeg dupe detector or something like that.
Benchmark it for a few laughs.
Your Product Key should be on Windows activation servers and you shouldn't have to worry about it in the future, but keep it on hand regardless.
I've got an Intel i5-6600K, built in 2016. 8 gb of RAM, 2 SSDs and 1 internal spinner. Asrock micro ATX board. No video card; no gaming; no overclock. Nothing fancy; standard home user. Browsing, Word, Excel, mp3 manicuring, video playback, etc. The only changes I've made since I built it was to change to an Intel 660p NVMe 2 TB data drive. I did upgrade from Win 10 Home to Win 10 Pro a few weeks ago.....only because I was bored and had an itch to upgrade something. Did me absolutely no good other than to relieve the itch, but I knew that before I hit the buy button.