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If you do not have "true" user-schema enterprise geodatabases then you are fine if you updated the SDE schema.
You may want to also upgrade to a later release than 10.3. Support for 10.3.x will be retired on Dec. 1, 2020; Esri Support ArcMap 10.3 (10.3.1)
what does it mean by a "true" user schema.
I started upgrade from 10.0 to 10.7 so its required to upgrade to 10.3 first, so I'm affraid of upgrading from 10.3 to 10.7 with out upgrade the user schema.
If you are not sure if you have what we call a user-schema geodatabase (Upgrade a user-schema geodatabase—Geodatabases in Oracle | Documentation ) then you should be good after upgrading the SDE schema.
Based on your original screenshot, it looks like you only need to upgrade the SDE schema and you should be good.
Hope that helps!