The only good thing about this is that the Russians are never on schedule and always late

Iran says Russian missiles could arrive this year
"Moscow notes that delivery is only dependent on how quickly the S-300 systems can be manufactured"

Countdown to Israel Attack: Russia Lifts Ban on Missile Sales to Iran
"Israel has treated the S-300 system as a “red line,” and has attacked Syria several times recently to prevent advanced Russian air defense and anti-ship missile systems from becoming operational."

Time to get really familiar with the Gog & Magog War if you aren't already.