Tomorrow Jan 7th is the big day when all Salesforce orgs are enabled for the Lightning Experience. Please note that this is only for users who have been enabled for the appropriate permissions.
Wondering what to do?
1. Check out the details on the Turn On Lightning Experience Critical Update Now Activates Starting January 7, 2020 Release Notes page. https://releasenotes.docs.salesforce.com/en-us/winter20/release-notes/rn_cruc_lex_turned_on.htm
2. Register for and attend the Circle of Success Webinar How to Successfully Transition to Lightning today Monday Jan 6th 1-2:30 P.M. EST. Also offered Feb 3rd and March second. https://register.gotowebinar.com/rt/3220195057581124356
3. Check out the Lightning Resources hyperlinked on the left hand side and the posts within this Lightning Success Group.
4. Let me know if you are interested in meeting to discuss the Lightning Success options in the attached file or if you would like to meet with a Salesforce Specialist to talk about Technical Questions. These services are being made as an investment to our Strategic customers.
5. Open a Salesforce Support case anytime with Lightning Questions. https://success.salesforce.com/_ui/core/chatter/groups/GroupProfilePage?g=0F93A000000LhcV