So to answer your question- what you really want to know is will Labour turn their policies into reality.
So in order to make their policies reality some things need to happen.
They need to either win the election outright or do well enough that with another party they can govern.
If they need another party to govern because they didn't win outright then usually the negotiations are around which policies will be kept and which won't.
So in that case they are unlikely to be able to make all their policies reality.
If they win outright, then they have to decide which ones are most important. Some policies will be simple to implement while others might need a change in the law.
If a policy needs a change in the law then they have to go through the process of doing that which involves the House of Commons and is slow.
A government once it has won an election will look at its policies and basically decide which are most important. Those will get done first.
Sometimes they run out of time to turn their policies into reality before the next election,