While the main menu shows the shortcuts, for example Draw: Shape > Arrange > "Bring Forward <Cmd> +", the text is not added to the context menu label.
In macOS, shortcuts in context menus are hidden by default, as per Apple's HIG. You can enable them under Preferences > LibreOffice > View > Visibility > Shortcuts. (BTW, the UI there is misleading: The option for icons labeled as "Menubar icons", while it actually affects context menus too. And the option for shortcuts labeled simply as "Shortcuts", while it actually designed to affect context menus *only*.)
(In reply to Maxim Monastirsky from comment #1) > enable them under Preferences > LibreOffice > View > Visibility > Shortcuts. Thank you, that's a perfect WFM.