will bing saves be retired as well or it is permanent?

There is no statement in the provided Microsoft documentation that Bing Saves is being retired.

What is documented is:

• Collections in Microsoft Edge is retired starting with Edge version 149.
• Personal Microsoft account users can still access previously saved collections through Bing Saves at https://bing.com/saves.
• For personal accounts, Collections content remains accessible through Bing Saves instead of export.

So based on the available documentation, Bing Saves remains the supported place for personal-account Collections content, but no permanence guarantee or retirement timeline is stated.

References:

• Organize your ideas with Collections in Microsoft Edge
• Save search results with Bing