Abhishek

You can start with

- Bhagavad Gita

- Autobiography of a Yogi

don't forget to document your spiritual practices in form of diary writing, statistics of record or vlogs etc otherwise there is a danger of becoming habitutated in reading big books and applying 0 knowledge from there.

 Later on to add some spice you can read

-https://www.goodreads.com/shelf/show/gurdjieff

etc

Actually in modern era you have to be both, earning good money and constantly practice spiritual practices. This delicate balance needs to recorded properly on a diary like did I miss any meditation session or not, am I eating good or just random unclean food? Am I focussig too much on money and loosing time for spiritual work? So spirituality is not for losers or winners but correct spiritual practice will make you happier, healthier, helpful and authentic/truth speaker without hurting or doing less damage to others.

Yes, spiritual progress can be measured by how are you feeling healthwise, are you feeling lighter, are you loving unconditionally without asking for something?

Are your old habits of eating, sleeping wastage of energy going away or not?

Are you becoming more real, authentic without doing much damage to others?

Are you interfering with others lives?

Are you becoming more sensitve for other people's pain?

Is your energy increasing?

Is lethargy or weakness reducing?

The first signs are you start getting bored in usual activity of eating, sleeping and passing the time on reels etc.

You start questioning what is life, why do we live, is there any way or everything is random eat->sleep->die->next birth and back to infinite loop? 

You become more authentic but still you can get trapped in new problems if you don't document proper progress. Cricket feels good because there is a clarity of stats etc.
Start maintaing records of daily meditation, fap or nofap, good food vs bad food, if you don't maintain records then you might fall back into new ways of ego like talking big things and not doing proper meditation.