When does ios 14 release on iphone 6

siddhartha ~ Apple offers many newer iPhone models which will run iOS 14:

iOS 14 and iPadOS are compatible with these devices

...found by searching Apple's Knowledge Base.

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Iphone 6 will only update to ios12.5.5 maximum.

it does not. Your phone is obsolete, it cannot update further then iOS 12.5.5 due to hardware limitations

Never. That phone is effectively obsolete. It is not capable of running anything higher than ios 12.5.5.