When God said, "Let the earth bring forth vegetation" that would mean that the earth had to produce the microbial life that the plants evolved from. Then after that the earliest fossils are plants.
But of course the Stromatolites from Western Australia are microbial plants and the Hematite tubes from this site are a bit iffy as to whether they are actual fossils of life or not.
It’s funny how you can believe that plants evolved from bacteria, and yet don’t believe that humans can evolve from older hominid species?
Sorry, but plants are not bacteria, and plants aren’t microbes.
There are one physical differences that separate bacteria and plants. That’s the physical makeup of their cells.
Bacteria are prokaryotes with prokaryotic cells.
Plants are eukaryotes with eukaryotic cells.
For instance, a single bacteria organism have only ONE CELL, and don’t require any other cells to live and to function, hence bacteria are often referred as unicellular organisms.
Plants are not unicellular organisms. They lived with many different types of cells, hence they are multicellular organisms.
Take a tree for example. When you look at tree, you would obviously see roots, the trunk and branches, as well as their barks, the leaves, as well as flowers and seeds.
But if you look at these parts of trees at cellular level, there are not only many cells, but there are numbers of different types of cells.
The flowers and leaves are made of different cells. The cells from leaves are different from the cells of tree trunk and branches and cells from the roots.
Every cells in different parts of the trees have different physical purposes and different physiological functions.
For instance, the cells in the roots, absorb the water from the soils and other nutrients and minerals from the soils, while trunks and branches served like pipelines that pump water to the leaves and flowers.
And the green leaves have cells that contained chloroplasts and chlorophyll in which the ultraviolet radiation cause chemical reactions between carbon dioxide (CO
2) and water (H
2O), converting them into starches (carbohydrates) and oxygen (O
2), hence the photosynthesis.
Carbohydrates, whether in forms of sugar or starch, are essential biological molecules as energy sources for all organisms.
The point is that plants have many cells as well as different types of cells, and each different cells have different physiological features.
Another example are mammals, including humans. Like the plants, humans have eukaryotic cells too, and we have many different types of cells that have different functions, like the blood cells are different from cells of tissues or different from the cells of our nerves.
Hence humans, as well as other mammals, are multicellular organisms, just as plant and fungi are also multicellular.
A prokaryotic cell has no cell nucleus and no organelles, which an eukaryotic cell have.
You really should read up more. You are still not grasping basic biology.