1. Passport: Your passport should be valid for at least six months beyond your intended entry date into Oman. It should also have at least one blank visa page for visa endorsement.
2. Visa Application Form: Complete the visa application form accurately and legibly.
3. Passport-sized Photographs: Attach recent passport-sized photographs with a white background. The specific size and quantity may vary, so check the requirements specified by the embassy or consulate.
4. Proof of Travel: Provide a copy of your confirmed round-trip flight tickets or travel itinerary showing your entry and exit dates from Oman.
5. Proof of Accommodation: Include a copy of your hotel reservations or details of your accommodation arrangements in Oman. This can be in the form of hotel bookings or a letter of invitation if staying with friends or family.
6. Financial Proof: Submit evidence of sufficient funds to cover your expenses during your stay in Oman. This can include bank statements, traveler’s cheques, or a credit card statement.
7. Travel Health Insurance: It is advisable to have travel health insurance that covers medical expenses, emergency medical treatment, and repatriation. Provide a copy of your insurance policy or a letter from the insurance company.
8. Additional Documents: Depending on your circumstances and the specific requirements of the embassy or consulate, you may need to provide additional documents, such as a cover letter explaining the purpose of your visit, proof of employment or study, proof of ties to your home country, or evidence of previous travel history.

Tourist visas for Oman typically allow a stay of up to 10 days, 30 days, or 90 days, depending on the type of visa granted. The duration of stay is determined by the immigration officer at the port of entry. It is important to adhere to the allowed duration and not overstay your visa to avoid any penalties or immigration issues.

The processing time for a tourist visa to Oman can vary depending on several factors such as the country from which you are applying and the time of year. Generally, it can take anywhere from a few days to a couple of weeks for the visa to be processed.