When you open the app on Chrome, you will see a sign informing you that Keep app will be moving from the Chrome app to the browser soon. It is also important to note that the access to Keep on the Chrome OS lock screen will not be available anymore.
Google Keep Chrome App to Shutdown in Feb 2021
According to Google’s support page, offline access to notes will not be available on the computer but still available on Google Keep mobile apps. The below-given steps are taken from Google support page. Google is encouraging users to use the web version of Google Keep instead. Existing users who have Chrome 86 or newer versions of the browser installed can complete the migration process to Google Keep on the browser easily. The Keep Chrome on the desktop will be replaced by a shortcut launcher, which will allow users to launch the Google Keep page by clicking on the icon on the desktop.
Offline access to notes will be available on Keep mobile apps, but not on your computer. Access to Keep on your Chrome OS lock screen will no longer be available. You can install a shortcut that opens Keep on your Chrome browser.
Use keep.google.com
Create a shortcut to keep.google.com
Existing users who have Chrome version 86 or newer will be able to migrate to keep.google.com by following instructions in the Chrome App. The Keep Chrome app on your desktop will be replaced by a shortcut launcher, which will allow you to launch keep.google.com by simply clicking on the icon on your desktop.