Is Default Magento 2 provide an order comment option just before placing the order?
If not someone suggests me a good plugin or any custom method to do.
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No, Magento default doesn't provide that function. If you only want give customer ability comment before placing order, try this Magento 2 Order Comment on Place Order
If you want more custom field on checkout page, try this https://amasty.com/order-attributes-for-magento-2.html
By default Magento not providing order comment feature, but you can use an extension for the same which is free.
You can use this free extension.