[be|live|keep] in clover

to be living a comfortable and luxurious life

The idiom "be in clover" has its roots in rural traditions, particularly in agriculture. Clover is a plant that is commonly used as fodder for livestock. Livestock that grazed in clover fields were considered to be well-fed and content. This phrase is used to describe someone who is living in a state of luxury, comfort, or great prosperity.

After a successful business venture, they are living in clover, surrounded by all the comforts and luxuries money can buy.
If the investment pays off, they will keep in clover and have financial security for the rest of their lives.
When they sold their successful business, they were in clover, finally able to retire early and fulfill their dreams.
With the recent promotion, he's been in clover, dining at high-end restaurants and traveling first-class.