If you want to post automatically on linkedin, hoot suite & Buffer are the best options. They are also useful to check statistics for your shared posts.
I agree with @Mit Thakkar, Hootsuite and Buffer are the best tools for scheduling your posts. But remember that your fans and followers use social media sites during specific hours. So to maximize your reach and engagement, post your content when your users are on these sites. This way you’ll be able to get more shares and notice an upsurge in traffic. The best time to post on LinkedIn to get maximum engagement is between 10 am to 11 am. and the best posting days start from Tuesday to Friday.
Hi, Mainly there is no need to follow any fix time slot. Its better to analyze for a week or month and then post on that times. Even this tools also provide a feature in which you can understand which time is best to post updates.