The projected global smart manufacturing market size in 2023 is expected to be 479.01 billion US dollars.
The global automation factory market from 2019 to 2021 can see a good amount of growth. The growth can be observed from 3% to 3.5%.

The global smart factory market size in different industries in 2020,

In my opinion, the industries will extend into agricultural, renewable energy, or even other industries where still the limitations with smart factories are present.
Source:- Smart factories