How do I check my icloud email on android phone

The following may help. Note that you will need to turn on two-factor authentication if you haven't already and use an app-specific password rather than your usual Apple password.

See information in:

https://www.androidcentral.com/how-set-your-icloud-email-account-android

and

Mail server settings for iCloud email clients - Apple Support

Also see:

Two-factor authentication for Apple ID - Apple Support

and

Using app-specific passwords - Apple Support