Giddyup said "I was wondering the same thing. I was laid off Mar 20 due to Covid and was told an ROE was submitted to Service Canada. I didn’t apply for a EI, just went straight to CERB as I was thinking the lay-off would be temporary. Now it looks like the earliest I’ll be going back to work is the fall but it could even be next spring. So once my four payments of CERB is done then what do I do? "
If you applied for cerb through the cra, then you'll have to apply for EI once cerb is done. Keep in mind, the last cra period is until the beginning of July so you wont be able to apply until then.