As we enter the digital realm due to the effects of COVID-19, the process of central banks phasing out physical cash from existence might take place soon. Before the outbreak, we've been accustomed in using credit/debit cards and contactless payments greatly eliminating the need for physical cash. Now that we're in a "COVID Era", things have accelerated quite a bit. Banks and governments are in talks of adopting CBDCs which could completely eliminate the need to pay for things with physical cash.
Now the real question is, how long will it take banks to start the transition from physical to digital cash (CBDC)? Do you think that physical cash will still be used right after governments adopt CBDCs in their entirety? Or will it take decades before every single person in the world stops transacting with physical cash, paving the way for a full-fledged cashless society? Your input will be greatly appreciated.

This issue is independent of the banking system. It depends more on the state of economic development of the state, the level of well-being of citizens, the percentage of urban and rural residents and a host of other factors. Wealthy states can try to forgo cash. However, most states are unlikely to succeed. There are categories of citizens who categorically will not agree to refuse cash or, for various reasons, will not be able to refuse it.