Adobe Flash Player End of life - Past Dec 31 2020, how is blocking of Flash content enforced?

I have Adobe flash on my computer which is Windows 7.  I only use it for very specified and very limited purposes, in particular, to view PDFs such as my bank statements and tax returns which I download on my computer.  I don't use it at all to create or work on any documents.   I understand that Adobe flash will be discontinued by very early 2021.  My questiton is very simple:  If I leave Adobe flash on my Windows 7 computer, after the Adobe flash is discontinued in early 2021, will I still be able to use Adobe flash simply to view these limited and/or print these type of documents, such as my bank statements and/or tax returns.  I would not be doing any work with or on Adobe at all, simply using it to view these limited documents that require Adobe to view and sometimes to print them out from my computer.  Please let me know as soon as possible.  AND, MOST  IMPORTANTLY, IF ADOBE WILL NO LONGER BE AVAILABLE FOR SUCH LIMIED PURPOSES, WHAT CAN I INSTALL TO CONTINUE USING ADOBE FOR THESE VERY LIMITED PURPOSES, I.E, VIEWING MY TAX RETURNS AND/OR VIEWING MY BANK STATEMENTS.  I APPRECIATE A QUICK RESPONSE.  THANK YOU VERY MUCH FOR ALL YOUR HELP IN ADVANCE.

If Flash Player will be gone by the end of December.  What do we use beyond 2020?  

The EOL guide you pointed to links off to the roadmaps for each of the major US browsers.  The story ends with the browsers removing the plug-in APIs necessary for Flash Player to run.  Before then, the browsers will continue to make Flash Player increasingly painful to run.  We're already at a fairly high level of friction in that regard, but it gets worse.

You have a couple options: 

• You could convert your web application to a standalone AIR application.  Adobe AIR is EOL, but HARMAN maintains and distributes a copy of the AIR SDK that you can license. 
  
  More info: https://airsdk.harman.com/
  
  
• Your organization and/or customers could license and distribute a maintained version of Flash Player within their organizations.  This would allow you and/or your customers to run the application unchanged, while still getting security and functional updates that keep Flash Player working.
  
  More Info:
  https://services.harman.com/partners/adobe
  
  
• You might think about providing a virtualized, ephemeral desktop environment that allows users to access your software with a legacy software configuration on modern clients, while insulating your environment from risk.  The whitelist would be helpful in risk reduction here, but since most browsers will remove the supporting APIs, you'd need to encapsulate a working configuration and secure it appropriately.  This is typically an expensive and cumbersome option, but it's not unusual for enterprises to need to maintain and secure support to legacy systems.  There's a well established playbook, and most of the big virtualization vendors have solutions.

The enterprise EOL page provides more information. In short: playback will also be blocked by the Flash Player itself, but there is a whitelist option for websites. This is at your own risk and depending on browser support. HARMAN will provide commercial support.

Regarding browsers: Firefox ESR might continue to support Flash until summer 2021, as it it based on Firefox 78 and Flash will be removed in Firefox 84. This is not yet definitive, but seems to be an option according to this post. If so, you would need to use the whitelist option that Adobe provides and there will stil be security risks ofcourse.