You can manually download and install it  [URL] If you're waiting for Windows Update to provide it, that could take months -- it's not clear whether Windows 11 is available yet by Update, but it's clear that this process will take months, so it could be quite a while before you see it available that way.  
I waited for a day and I thought I could upgrade to windows 11 yesterday. I can see that my laptop is eligible for the it. So do I have to wait for it?  
Windows 11 upgrade