Now, my site is working fine. After setting page rules, enabling “Always Use https”, I enforced a redirection in the .htaccess file in my cpanel, and I waited for few hours, may be around 6-8, then my site started working fine. Now it opens on https only with all the URLs.
But still, I would like to know that does it take 6-8 hours after doing all these things for redirection? Is it normal?
It sounds odd, such a change should usually be applied in a matter of seconds.
You should be able to remove the redirection on your side and rely on the redirection at the Edge.
You did the right thing:
Once you’ve set up HTTPS, make sure that all unsecure HTTP traffic to your site is redirected to HTTPS: Use canonical links in the head of your HTML page to help search engines figure out the best way to get to the page. Configure your server to redirect HTTP traffic to HTTPS: