this folder can be accessed via a button on the bookmarks bar's right side, named "Reading list."
Once pressed, a dropdown list shows all the tabs that have been set aside, along with the tabs that have already been read.
"read later" reading list now available on Chrome mobile for saving tabs to your read later list
once you enable the read later flag on all chrome browsers your reading list also syncs if you are signed in to chrome < you might need to toggle that on via your chrome sync settings if you use customise sync
to save a tab, web page, to reading list on Chrome mobile just bookmark the web page/tab and tap "reading list"
ICYMI
this has been available for some time now
chrome://flags/#enable-reader-mode
enables a reader mode icon inside the omnibox
or address bar to none ChromeOS users
akin to the one found in Firefox and Opera