Polls can be good indicators of the outcome of elections but they can't be trusted. There are so many polls that didn't accurately predict the outcome of elections. If they were accurate Hilary Clinton would have defeated Donald Trump in the 2016 United States presidential election because almost all the polls predicted that she would will the elections. Don't also forget that Recep Tayyip Erdoğan enjoys a lot of support from nationalists, and religious conservatives who believe that Turkey shouldn't promote closer ties with the West.
Turkey is a great asset to Russia. Turkey and Hungary are core supporters of Russia in NATO. Russia will do everything possible to ensure that Erdoğan wins the election because if he losses Kremlin has lost a close ally. This is because the main opposition candidate Kemal Kilicdaroglu is pro-west.
This election is unpredictable because both main candidates have a lot of supporters. Let the election be free and fair from manipulations so that the best candidate can win.