High-Level Timeline

(info) September thru the end of October - Plan, create/update test scripts in ALM, move pending support & project work into production.
(info) 10/11/2018 - SAP release of year end base level support pack
(info) 10/18/2018 - Last date to implement support & enhancement changes until freeze ends on 12/12/2018
(info) 10/19/2018 - Development Freeze begins
(info) 10/22/2018 - End of day production snapshot to be used to refresh test environments (9/24 for SF3)
(info) 10/24/2018 - Unit test

(info) 11/01/2018 - 11/02/2018 Controlled Payroll Runs (SH2)

(info) 11/05/2018 - System Integration Test (regression test fixes: 11/29-30/2018)

(info) 12/07/2018 - Go-live weekend! (start Friday at 5pm)

(info) 12/12/2018 - Development Freeze ends

(big grin)

Alternate High-Level Timeline

(tick) September thru the end of October - Plan, create/update test scripts in ALM, move pending support & project work into production.
(tick) 10/11/2018 - SAP release of year end base level support pack
(tick) 10/18/2018 - Last date to implement support & enhancement changes until freeze ends on 11/21/2018
(tick) 10/19/2018 - Development Freeze begins
(tick) 10/22/2018 - End of day production snapshot to be used to refresh test environments (9/24 for SF3)
(tick) 10/24/2018 - Unit test

(tick) 11/01/2018 - 11/02/2018 Controlled Payroll Runs (SH2)

(question) 11/05/2018 - 11/09/2018 (one week) - System Integration Test (regression test fixes: 11/12-13/2018)

(question) 11/16/2018 - Go-live weekend! (start Friday at 5pm)

(question) 11/21/2018 - Development Freeze ends

(sad)