Delay sprays are generally just numbing sprays. So long as you aren't allergic to lidocaine or similar products, they are generally safe. You can also use them with condoms.
On average, they add about 3-4 minutes of time for you.
Have you spoken to a doctor about your issues? Have they found the cause for your problem?
These sprays are meant to use all the time, and I don't know how often you plan to use them.
How quickly are you ejaculating? A lot of men think they are ejaculating quickly when they really aren't. Premature ejaculation is defined as ALWAYS or NEARLY ALWAYS ejaculating within 1-3 minutes.
https://www.mayoclinic.org/diseases-conditions/premature-ejaculation/symptoms-causes/syc-20354900
The average time for ejaculation is less than one minute to over 30 minutes, with the average being 5-7 minutes. Have you tried masturbating before sexual activity? Does that delay anything?
If it's truly PE, talk to your doctor before using anything. There may be a medical cause.