Doesn't appear the Catalina macOS 10.15.7 is supported on an 2010 MacBook. Neither is
the Screen Time monitor app. ~ See which computers Catalina is supported to run, this
Support document with references to those models that can be used.
• macOS Catalina is compatible with these computers - Apple Support
https://support.apple.com/en-us/HT210222
(Screen Time? Seems only useful on much newer model Mac computers.)
Used to be Parental Controls; then was changed; then runs on newer OS.
To see which model computers could run major newer macOS systems
and where their hardware drops support, documentations exist online.
Generally ~ for very basic, of which ones could be run in what Mac, see:
• How to get old versions of macOS - Apple Support
https://support.apple.com/en-us/HT211683
This does not tell 'exact hardware build' supports Screen Time monitor app.
Other documentation probably does; something rather newer, almost sure.
While more details exist in other articles, this mostly covers iDevices:
• Use parental controls on your child's iPhone, iPad, and iPod touch - Apple Support
https://support.apple.com/en-us/HT201304
"With Content & Privacy Restrictions in Screen Time, you can block or
limit specific apps and features on your child's device. You can also
restrict the settings on your iPhone, iPad, or iPod touch for explicit
content, purchases and downloads, and privacy."
• How To Set Up Parental Controls On Mac: Screen Time And More - Macworld UK
https://www.macworld.co.uk/how-to/set-up-parental-controls-mac-3780629/
"Share your Mac with your child thanks to separate accounts and the free
parental controls that come in macOS. We show you how to set them up."
