Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
If you search for Word, or Excel, for example, in the search on the taskbar, do you see the app you can launch?
If so, once launched, make sure you sign into the same account you used for the purchase. The user icon on the upper right cna be clicked on, to see which account you use to sign in, you can sign out and use a different account if it is not using the correct account right now.
If it is not even installed, please go to https://account.microsoft.com/services
Sign in to the Microsoft account
Find the option called "Install desktop versions of Microsoft 365 apps like Word, Excel and Powerpoint to your devices". It has a down arrow icon next to it.
Click on that. It should start downloading the installer file. Then you just need to run that installer file to install the apps.