What should I do if i don't receive the 1099 NEC form on time? I keep asking my employer and he keeps saying he will send it, but so far i haven't got it.

Enter the income as Cash.

Since you have selected the Live Premier edition see this TurboTax support FAQ for how to contact a Tax Expert - https://ttlc.intuit.com/community/expert-review/help/how-do-i-connect-with-a-tax-expert-in-turbotax-live/00/27282

Just to clarify: You do not have an "employer" if you received a 1099-NEC.  Employers issue a W-2.