The admins approval is usually done in 1-2 days of submission. So you can wait for 48 hours and hopefully your signature and passport size you have uploaded, if correct will be approved soon. You have nothing to worry about it and instead you should focus on your NEET revisions.

For NEET Revision strategy visit the link below:

https://medicine.careers360.com/articles/revision-strategy-for-neet

I hope this answer helps. All the very best for your future endeavors!