There are no general restrictions for travel into Turkey at the moment. However, the situation varies due to changes in Covid-19 pandemic. You should check with the Consulate or Foreign Ministry (https://www.mfa.gov.tr/visa-information-for-foreigners.en.mfa), or the e-visa system (https://www.evisa.gov.tr/en/), or through your airline (for instance, Turkish Airlines updates the requirements timely: https://www.turkishairlines.com/en-gb/announcements/coronavirus-outbreak/travel-restrictions/) for updates.
