All interpretations based on your doctrine. That's backward. We don't conform the bible to our doctrine but our doctrine to the plain reading of scripture.
The point being made, not only in Genesis but also in the Exodus passages is the God created everything that exists in six days.
John 1:1 In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was in the beginning with God. 3 All things were made through Him, and without Him nothing was made that was made.
Speculation
Not necessarily. God didn't have to wait for the trees and grass to grow because He created them fully mature. The same is true of the rest of creation.
Psalm 104:2 Who cover
Yourself with light as
with a garment, Who stretch out the heavens like a curtain.
Isaiah 40:22 It is He who sits above the circle of the earth, And its inhabitants
are like grasshoppers, Who stretches out the heavens like a curtain, And spreads them out like a tent to dwell in.
Isaiah 42:5 Thus says God the Lord, Who created the heavens and stretched them out,...
Isaiah 44:24 Thus says the Lord, your Redeemer, And He who formed you from the womb: “I
am the Lord, who makes all
things, Who stretches out the heavens all alone, Who spreads abroad the earth by Myself;
Isaiah 45:12 I have made the earth, And created man on it. I—My hands—stretched out the heavens, And all their host I have commanded.
Isaiah 48:13 Indeed My hand has laid the foundation of the earth, And My right hand has stretched out the heavens; When I call to them, They stand up together.
Isaiah 51:13 And you forget the Lord your Maker, Who stretched out the heavens...
Jeremiah 10:12 He has made the earth by His power, He has established the world by His wisdom, And has stretched out the heavens at His discretion.
Jeremiah 51:15 He has made the earth by His power; He has established the world by His wisdom, And stretched out the heaven by His understanding.
Zechariah 12:1 The burden of the word of the Lord against Israel. Thus says the Lord, who stretches out the heavens, lays the foundation of the earth, and forms the spirit of man within him: