Is it safe for me to upgrade from Quicken Deluxe 2017 R20.2 to Quicken Deluxe 2019.

You will not be better off waiting.  Generally, the issues with the banks are not specific to the Quicken year we use.  The only area of concern is if you use Quicken Bill Pay.  The issue is the Quicken subscription requires a new Quicken Bill Pay account and, as the Quicken Bill Pay service is being discontinued as of August 31, it may be difficult to obtain a new account.