I see that Solutions has been released and have it in my trial and community plan environments, but not in my company's default environment. Is this my company's choice or does it take longer for Microsoft to upgrade production/default environments?
I do not know what environment version my default environment is. My trial environment is 220.127.116.118
Based on your statement, I think your PowerApps Environment is in a old version.
Currently, the solution experience is available only online and only for environment version 18.104.22.1687 and later. To check you Environment version, please go to: PowerApps Admin Center -> Environments-> select your environment-> Details tab.
If you don't find the version within the Details tab of your environment, it means that your PowerApps environment (your default environment)is in a old version.
More details about the Solution experience, please check the following blog (at the bottom of the page):
In addition, upgrading default environment (old version environment) is not supported within PowerApps currently, if you would like this feature to be added in PowerApps, please submit an idea to PowerApps Ideas Forum: