Automatically turning on the chat/messenger window when users access Facebook Page will help your page to increase interaction very quickly. Thereby helping to improve sales opportunities of the business.
Ideally, you’re online, which is symbolized by the green dot next to your page name. Fortunately, this is not compulsory. Facebook also helps you with the popup (only) if you’re expected to answer questions promptly.
Have a chatbot and answer questions automatically. So this would prompt visitors to send messages to you even if you’re (temporarily) offline.